PerryTPlatypus

By the texts of all three Abrahamic faiths, the Universe is not eternal. God created it at a certain point and he will remake it at the end of time. God existed before it and will continue even if the Universe no longer exists.

Nothing that has a beginning can be infinite. There is no bridge, no point where you can cross between finite and infinite. Since we know the universe has a beginning with a small and finite size (the Big Bang), we know it cannot be infinite. Because of the limits of the speed of light we cannot see the entirety of the universe at once, but that doesn't mean it is infinite, just larger than we can comprehend.