Answer:
Islam accepts the Judaism and Christianity as true religions of God and respect them and their prophets (Moses and Jesus (peace on them)) and consider them religions from God but designed for their own time.
Islam believes a true believer in God should always accept and follow the newest religion of God. because religions are deviated and changed during long history and when is needed God send new religion.
islam believes a wise believer always should seek truth and find the best religions and should hear all voices and select the best.