Does God forgive all abominations committed by a young man, and does He accept his repentance, and how can he erase all his sins? And is one who commits sodomy or fornicates with his sister considered an infidel?

We praise Allah for guiding you to repent from sodomy and incest, for these are among the most heinous crimes. However, whoever repents sincerely to Allah, He forgives him. The conditions for sincere repentance are: abandoning the sin, regretting it, and resolving never to return to it. You must also increase in good deeds and cut ties with bad company. The perpetrator of these abominations is not an infidel, but he has committed grave major sins.