And you reject God based on guesses?<quoted text>
The best guesses at this point of what happens before the Planck time:
1. A previous, contracting universe.
2. A multiverse from which ours pinched off.
3. Nothing. Time may simply not be definable then.
Using 2 arguments that argue against causality.
And 1 argument based on the idea that nothing exploded.
So your basic assumptions for the beginning of the universe, and the options you allow, all avoid the need to base those claims on the reality we actually observe?
And then you decry Christianity, which provides a rational testable logical argument for its absolute truth statement...