How does that make him a "God"?
We believe he is Christ's vicar on earth and therefore has some sway to make pronouncements like these... but this in no means elevates him to the status of deity.
Ok...what does his pronouncement mean then, exactly? That if you aren't Catholic, you aren't a proper Christian? Is it illogical to extrapolate then that you aren't entitled to eternal life in Heaven?
In my humble opinion, only one being has the power to make that decision, and it is not the Pope...