This is of course wrong, Mohammed as an illiterate man can copy things because he grew up in a christian and jewish influenced society and no doubt heard the stories of biblical characters and then decided to incorporate them into his own retelling, including various historical errors that make his retelling impossible to be true. https://en.wikipedia.org/wiki/Mary_in_Islam#:~:text=Accordin....

It is also false to say that gaining followers through appeasement is the way to go, there is not a single sect in christianity that doesnt change vital parts of the bible or how to be saved. It is far easier to obfuscate and pretend to follow christianity and then make changes later.