does a fact which could have 3 different explanations not count as evidence for any of them?

There aren't three explanations. There are infinite explanations. A few of them are indicated by some empirical evidence, and are thus likely to be correct. The rest are equally unlikely.

So an omnipotent, omniscient, male god as described in a particular set of Abrahamic literature creating the universe/earth in seven days is as likely as a 15 light year wide water buffalo made of mayonnaise and lime jello creating the universe through a 952 year long bowel movement. There is equivalent evidence for these, and infinite other explanations.

This doesn't have anything to do with "multiverses" or any philosophical rambling. This is just statistics.