[Dimensio]

I think he might be saying that causality must have a beginning.

What has that to do with rationality? Or is this another non-sequitur like you bringing up atheism in a discussion about evolution?

[reasonisfaith]

Think of causal logic as a progressive, ordered path of ideas or concepts (because that’s what it is.)

And by the way, do you really not understand the significance of atheism to this discussion? I might be willing to explain it to you, that is if you really need the explanation, but it will waste time and you will appear a little dumber than you had probably hoped.