Christian motivations for joining AF

[TruthWorthy]

there's no substance in saying there is evidence in a perspective, in rationalisation. It's just preposterous.

No evidence in rationalisation, no.

and none resulting from, derived, accumulated, or, theoretically, assumed (although many will make an assumption).
You're hypothesis of god is from inductive reasoning, if you take god as a given then all sorts of assumptions can be based on that. The biggest weakness in this way of thinking is that every additional inference is based on the previous one. It's a massive body of lies, the probability of which reduces with each new inference.

However, the existence of the god of the bible can be tested.

By comparing the events portrayed in the bible to reality.

I'd say this is only a comparison and has no way of proving god's existence.