Why infinite? I'm not saying it isn't an extremely large number, but the universe is only so big, isn't it?
Let me rephrase, as "infinite" is misleading. Statistically, the universe is
nearly infinite (as in, the numbers are so vast that the probability of
anything happening becomes a near-certainty), since the estimated observable diameter is 93 billion light years. There are 200 billion observable galaxies.
Our own Milky Way galaxy has 200-400 billion stars, an estimated 50 billion planets around those stars, of which 500 million are estimated to be in the habitable zones around their stars.
So with around 200 billion galaxies observable, and assuming that all galaxies are the same size as the Milky Way (many are bigger), we're now talking 200 billion galaxies multiplied by 500 million theoretically habitable planets, which to save you the mathematics is 1.0 × 10*20.
Or 100,000,000,000,000,000,000 (100 quintillion) theoretically habitable planets. I don't know about you, but numbers like that are as good as infinite statistically. And that's just in the 13-odd billion light year range we can see.
Now life is a statistical certainty, since we're the evidence of that. I actually missed your inaccuracy before about us not knowing how life started, because we're well aware of how life started on our planet - it's essentially down to a few simple "ingredients", the "building blocks of life". We're not quite sure how those building blocks got here, but in 4.5 billion years of our planet (most of which was very violent physically and chemically, the sort of conditions that change chemical compounds) there's been plenty of chances for life to form. Given those quadrillions of other potential chances for life to form, life elsewhere in the universe is as good as a statistical certainty.
Put another way: If the chances of life existing were a number pretty close to zero... say, 0.000000000001, then that still leaves 100 million planets likely to harbour life
I'm certainly not saying it'd be intelligent life, but life is life. We're talking in terms of almost unimaginable numbers here, and I'm aware it's very difficult to wrap your head around (it's taken me quite a long time to work out this post!) but life elsewhere in the universe is essentially a statistical certainty, or basically there are near-infinite chances for life.
And
that's what I meant by infinite
That's also why (getting slightly closer back to the topic of God
) it makes more sense that things
can just "happen", because with such huge numbers the chances of even the most unlikely events happening become massively more likely. And the more likely that something is to happen, the less relevant the concept of a God who created everything becomes.
If our solar system was literally the only thing that existed in the universe and beyond us the laws of the universe were completely different, and our existence made no sense whatsoever, then the case for God would be much easier to argue, because we'd have no suitable answers as to how we got here.