I don't know. It could have been an extraterrestrial origin, could have been 'a lightning strike'. A few years ago though I remember seeing a documentary where a scientist got close to creating a simple alive cell using electricity, and a mixture of elements that were in the atmosphere billions of years ago. I think the farthest he got was creating amino acids using the substances that is believed to have been present long long ago.

There are people who say "something cant come from nothing". and they are right, because to grow... to create new cells in your body, you need food intake... matter (just like how pregnant women eat a lot). we dont know how matter first formed single cells, could be through what i described in the above paragraph. and that matter could have come into existence... we dont know. could have always been in existence. could have been converted from suspected 'dark matter/energy'.

what us non-believers do believe though is.... that belief in a god is futile, no point. if there is such entity, it does not intervene. the universe is not effected by it. only the natural world and its properties are in the universe. We believe in nature, and whatever mysterious properties nature has is only a natural part of nature, a purely secular thing. If that is god, then why call it God? It is simply not.

is that an answer to your question or is it my view on why time is time?

to me time is simply the ∫ [an instant] dt

with on how it exists, no one knows.