That's an incredibly ignorant and wrong statement.
Every practicing Catholic, everywhere in the world, recites at every Sunday Mass, and is bound to believe, the Nicene Creed. Practically every word of the Nicene Creed after the first phrase ("I believe in one God") is erroneous according to Islam, and most of it is considered flatly blasphemous.
If I'm a Muslim, I live in a permanent state of blasphemy and really ought to be stoned and/or beheaded.
Oh, BTW, Mohammed wasn't a prophet of God. Stone me some more.
Still think Catholicism and Islam are the same?
I was hoping that was just a mistake.
But you never know with some of these people.