Muslims also say Jesus, Moses, Noah, Abraham, and Adam were Muslims. In fact, Islam says they were all the "first" Muslims, even though they lived years apart. Not sure how you can have 5 First Muslims, that kind of defeats the purpose of the word first.

They also say Abraham built the Kabba or whatever. Even though there is no record of Abraham ever going to Mecca.

So yeah, Islam just takes things and makes them their own. Intellectual theft basically.