John the Baptist is to Christians what Jesus is to Muslims.
The next day [John] saw Jesus coming toward him, and said, “Behold, the Lamb of God, who takes away the sin of the world! This is he of whom I said, ‘After me comes a man who ranks before me, because he was before me.’” John 1:29-30
And remember Jesus, the son of Mary, said: "O children of Israel! I am the Messenger of Allah to you confirming the Law before me, and giving glad tidings of a Messenger to come after me, whose name shall be Ahmad (Mohammed).” As Saff 61:6
Imagine if someone approached you with a new faith message and told you he is a follower of John the Baptist. What would you think?