How do you know that religious faith was created by man? What are your standards of proof? Do you deny the possibility of Divine revelation?
Well, ultimately, everything is God’s creation.
I do not know any of this, but I believe religions are the creation of man, desined to effect some control over a group. A belief of some Divine revelation would certainly aid in it’s popularity. Although, I don’t know how that revelation would be recognised, and distinguished as being any more valid than any other belief in a Divine revelation.