Do to really believe a snake talked?!

[John V]

Mainstream science says that, since the big-bang, approximately 13.6 billion years have passed, 13.6*10^9 years.
What happened before the big-bang is speculation. If there was already a Universe, so much the better, but we don't know.

I've already done the speculation:

The universe could have existed eternally as a singularity. However, there's then no reason for the big bang.

Universe was not a singularity, collapsed into a singularity, then big bang: i.e. a cyclic universe.