Does Allah forgive or not 194

Allah says that his Koran is a book obvious (Koran 34.3 ; 43.2 ; 44.2), of an perfect clear (Koran 24.54 ; 36.12), unequivocal (Koran 39.28), Thus, does Allah forgive all the sins (39.53), in including idolatry (Koran 2.51 ; 4.153 ; 25.70), or not (Koran 4.48,116) ? Does he forgive slander of chaste women (Koran 24.5), or not (Koran 24.23) ? He says also that the one who will find contradictions in the Koran will have the proof of its falsity (Koran 4.82). And he invites the lucky muslim who realized it to become christian (Koran 10.94 ; 3.55), since it is true that imposture cannot always to be hidden. Who indeed can to come after the Christ, other than the antichrist ?