The Moon Is Just the Right Size

Earth is basically the only planet some say that life could exist on because it has all these features, one of which are meteorites. The moon happens to be at just the right distance and includes the sun exactly by the same diameter as the sun apparent angular diameter. How many planets have those things? I think there's an almost infinite number. On the other hand, my colleagues will say the probability of God is zero. And I think that is hard to intellectually rationalize for someone who's an objective scientist. So what do you think about atheism and agnosticism? Do you think it is necessary for a scientist to be an atheist? Or is that something that you don't agree