Your good deeds are of no avail if you leave Islam

And it was already revealed to you and to those before you that if you should associate [anything] with Allah , your work would surely become worthless, and you would surely be among the losers."

[Qur'aan 39:65]

He who leaves Islaam will not benefit from the good deeds he did while he was a Muslim.

If a person dies while in the state of being a kaafir, he will abide in hell forever.

If a person had performed the obligatory Hajj of Islaam and then became an apostate and then became a Muslim again, then according to the Madhhab of al-Shaafi'i he does not have to perform the Hajj again while according to Maalik he has to perform the obligatory Hajj of Islaam again.