Pesach - The Holiday of Faith

 https://www.torahweb.org/torah/2007/moadim/rwil_pesach.html

Pesach, from its very inception, represented the antithesis of idolatry: "Draw your hands away from idols and take for yourselves a sheep of mitzvah" (Rashi, Shemos 12:6). "And the people believed" (4:31); belief in Hashem and His messengers, Moshe and Aharon, began the redemption process.

"This is the law of the Korban Pesach: any stranger may not eat from it" (Shemos 12:43). "Any stranger" includes one who knowingly rejects all, or even part, of the Torah (Rashi, Gur Aryeh). The opening law stated regarding the Korban Pesach emphasizes the indispensability of faith in Hashem and His Torah on Pesach. The wicked son is excluded from the Korban Pesach, even though he too left Egypt, because his lack of faith disqualifies him from the final geula.

The Beis Halevi (parshas Bo) comments that Pesach is linked to the ultimate redemption. Since denial of the validity of the Oral Torah led to the destruction of the second Beis Hamikdash, acceptance of this belief is a prerequisite for its rebuilding.