Your reply is very confusing. There are false gods. God Himself has commanded that we have no other gods before Him.
It is clear, to me at least, that the Muslim god is not the God of the Bible that I worship. The supposed “Jesus” in the Koran, Isa actually, was not crucified and resurrected.
I’m afraid this pope is falling into the same sort of delusion that we heard in Rick Warren’s prayer at Obama’s swearing in ceremony.
In reality, any "false gods" are either figments of someone's imagination, or demonic entities. Isaiah says in several places that there's only one God; in fact, he quotes God saying "are there any others? I know not one".
There are also false descriptions of the true God. That's where Islam fits in. They're right to say there is one true God, they're right to say that he created the universe from nothing and without any obligation on his part, and they're not right about much after that.