We know that there are billions of stars in our galaxy, the Milky Way. Those stars can each have several planets in orbit around them.
We know that there are billions of galaxies in the visible universe.
Using those two facts, let's estimate that there are at least 1,000,000,000,000,000,000 planets in the universe. Of those let's say only .000001% can contain life. That leaves a (conservative) estimate of 1,000,000,000,000 (one trillion) potential alien civilizations.
Yet our little mud ball of a planet is the center for religion, God's divine revelation, judgment, His son the Messiah, and the path to paradise in the afterlife? It is because of statistics like the above demonstrated that I reject revealed, earth bound, man made religions and embrace deism.