To be fair, even Tanakh (Hadashah not included for the purposes of this discussion) indisputably and unequivocally warns of Gehenna or Gei Hinnom along with Gan 'Eden (Yesha'yahu 66:17-24, Dani'el 12:2-3). Even Talmud Bavli talks of Gei Hinnom (e.g., Gittin 57a; where, according to the Munich Codex of the Talmud, they believe that Yeshua is). Gei Hinnom is and should be no joke. As Max Lucado states, we too often make light of Gei Hinnom.
So if you continue to reject Yeshua as Mashiach, you may be among the Yehudim who are not of the remnant. Yesha'yahu 66:17-24 admonishes clearly:
The same goes for (as Hadashah is included in this discussion of) those who insist that a Meshichi must be shomer Torah, "who came in by stealth to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage" (Galatians 2:4b). When you observe Pesach, think about why you are compelled to do it: you might not actually be under chen, or grace:
So if you continue to reject Yeshua as Mashiach, you may be among the Yehudim who are not of the remnant. Yesha'yahu 66:17-24 admonishes clearly:
“Those who sanctify themselves and purify themselves,
To go to the gardens
After an idol in the midst,
Eating swine’s flesh and the abomination and the mouse,
Shall be consumed together,” says the Lord.
To go to the gardens
After an idol in the midst,
Eating swine’s flesh and the abomination and the mouse,
Shall be consumed together,” says the Lord.
18 “For I know their works and their thoughts. It shall be that I will gather all nations and tongues; and they shall come and see My glory. 19 I will set a sign among them; and those among them who escape I will send to the nations: to Tarshish and Pul[a] and Lud, who draw the bow, and Tubal and Javan, to the coastlands afar off who have not heard My fame nor seen My glory. And they shall declare My glory among the Gentiles. 20 Then they shall bring all your brethren for an offering to theLord out of all nations, on horses and in chariots and in litters, on mules and on camels, to My holy mountain Jerusalem,” says the Lord, “as the children of Israel bring an offering in a clean vessel into the house of the Lord. 21 And I will also take some of them for priests and Levites,” says the Lord.
22 “For as the new heavens and the new earth
Which I will make shall remain before Me,” says the Lord,
“So shall your descendants and your name remain.
23 And it shall come to pass
That from one New Moon to another,
And from one Sabbath to another,
All flesh shall come to worship before Me,” says the Lord.
Which I will make shall remain before Me,” says the Lord,
“So shall your descendants and your name remain.
23 And it shall come to pass
That from one New Moon to another,
And from one Sabbath to another,
All flesh shall come to worship before Me,” says the Lord.
24 “And they shall go forth and look
Upon the corpses of the men
Who have transgressed against Me.
For their worm does not die,
And their fire is not quenched.
They shall be an abhorrence to all flesh.”
Upon the corpses of the men
Who have transgressed against Me.
For their worm does not die,
And their fire is not quenched.
They shall be an abhorrence to all flesh.”
The same goes for (as Hadashah is included in this discussion of) those who insist that a Meshichi must be shomer Torah, "who came in by stealth to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage" (Galatians 2:4b). When you observe Pesach, think about why you are compelled to do it: you might not actually be under chen, or grace:
"7 Remember those who rule over you, who have spoken the word of God to you, whose faith follow, considering the outcome of their conduct. 8 Jesus Christ is the same yesterday, today, and forever. 9 Do not be carried about[c] with various and strange doctrines. For it is good that the heart be established by grace, not with foods which have not profited those who have been occupied with them.
"10 We have an altar from which those who serve the tabernacle have no right to eat. 11 For the bodies of those animals, whose blood is brought into the sanctuary by the high priest for sin, are burned outside the camp. 12 Therefore Jesus also, that He might sanctify the people with His own blood, suffered outside the gate. 13 Therefore let us go forth to Him, outside the camp, bearing His reproach. 14 For here we have no continuing city, but we seek the one to come. 15 Therefore by Him let us continually offer the sacrifice of praise to God, that is, the fruit of our lips, giving thanks to His name. 16 But do not forget to do good and to share, for with such sacrifices God is well pleased." (From Ivrim 7).
You can be easily condemned to Gei Hinnom for still keeping all 613 mitzvot while claiming to be under chen:
For the law, having a shadow of the good things to come, and not the very image of the things, can never with these same sacrifices, which they offer continually year by year, make those who approach perfect. 2 For then would they not have ceased to be offered? For the worshipers, once purified, would have had no more consciousness of sins. 3 But in those sacrifices there is a reminder of sins every year. 4 For it is not possible that the blood of bulls and goats could take away sins...
11 And every priest stands ministering daily and offering repeatedly the same sacrifices, which can never take away sins. 12 But this Man, after He had offered one sacrifice for sins forever, sat down at the right hand of God, 13 from that time waiting till His enemies are made His footstool. 14 For by one offering He has perfected forever those who are being sanctified.
15 But the Holy Spirit also witnesses to us; for after He had said before,
16 “This is the covenant that I will make with them after those days, says the Lord: I will put My laws into their hearts, and in their minds I will write them,”[c] 17 then He adds, “Their sins and their lawless deeds I will remember no more.”[d] 18 Now where there is remission of these, there is no longer an offering for sin.
Hold Fast Your Confession
19 Therefore, brethren, having boldness to enter the Holiest by the blood of Jesus, 20 by a new and living way which He consecrated for us, through the veil, that is, His flesh, 21 and having a High Priest over the house of God, 22 let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience and our bodies washed with pure water...
26 For if we sin willfully after we have received the knowledge of the truth, there no longer remains a sacrifice for sins, 27 but a certain fearful expectation of judgment, and fiery indignation which will devour the adversaries. 28 Anyone who has rejected Moses’ law dies without mercy on the testimony of two or three witnesses. 29 Of how much worse punishment, do you suppose, will he be thought worthy who has trampled the Son of God underfoot, counted the blood of the covenant by which he was sanctified a common thing, and insulted the Spirit of grace? 30 For we know Him who said,“Vengeance is Mine, I will repay,”[e] says the Lord.[f] And again, “The Lord will judge His people.”[g]31 It is a fearful thing to fall into the hands of the living God.
(From Ivrim 10)
Many have fallen away, if they even had yeshu'at v'chen to begin with because they "have become estranged from Christ, [they] who attempt to be justified by law; [they] have fallen from grace." However, if you observe Pesach and the other mo'edim without compelling yourself and others to do so as a means of tzedek v'tzedekah, you're okay:
One person esteems one day above another; another esteems every day alike. Let each be fully convinced in his own mind. 6 He who observes the day, observes it to the Lord;[a] and he who does not observe the day, to the Lord he does not observe it. He who eats, eats to the Lord, for he gives God thanks; and he who does not eat, to the Lord he does not eat, and gives God thanks. 7 For none of us lives to himself, and no one dies to himself. 8 For if we live, we live to the Lord; and if we die, we die to the Lord. Therefore, whether we live or die, we are the Lord’s. 9 For to this end Christ died and rose[b] and lived again, that He might be Lord of both the dead and the living. 10 But why do you judge your brother? Or why do you show contempt for your brother? For we shall all stand before the judgment seat of Christ.[c]