Sorry you've kind of lost me. Islam has a god and heaven as a fundamental part doesn't it? The argument is not that there's no Christian God, it's that there are no gods of any kind and the preposition of humanity to make up mythological religions for various reasons. All religions fall into this argument.
Just because Islam has God and Paradise as a fundamental aspect does not mean that you can conflate its presentation of God with the rest of the religions, which is my point. His argument is extremely brittle and laughable.
