The fact that Islam teaches and believes in the virgin birth of Jesus strengthens my faith in Christianity, because there a Christians who have rejected the virgin birth giving difficult to gainsay arguments as to why the NT leads people to believe what they feel is not true. They are no longer considering themselves Christians or Muslims saying Jesus was not born of God but of man, IOW, having a biological father and mother.
If Islam hadn't imperfectly borrowed the virgin birth story from the NT Bible, the Quran would've have sounded or appeared more original to me. The undisputable truth or fact is that the NT Bible came up with Jesus' original virgin birth story first and foremost.
I believe Muhammad couldn't have gotten that from any other source. The irony is that Islam accepts the virgin birth story of Jesus recorded in the Scriptures that came before the Quran, but it rejects the reason for Jesus' virgin birth. IMO, trying to get Christians to believe the virgin born Jesus is not the son of God is like trying to get people believe that when one drinks water they don't get water in their throats.
John 3:16 “For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life. 17 For God did not send his Son into the world to condemn the world, but in order that the world might be saved through him. 18 Whoever believes in him is not condemned, but whoever does not believe is condemned already, because he has not believed in the name of the only Son of God. 19 And this is the judgment: the light has come into the world, and people loved the darkness rather than the light, because their works were evil. 20 For everyone who does wicked things hates the light and does not come to the light, lest his works should be exposed. 21 But whoever does what is true comes to the light, so that it may be clearly seen that his works have been carried out in God.”
Jesus is the light of the world. Those who do not see that as truth are blind and lost walking in darkness.