To believe there may be a God and not investigate is irrational Stranger.
What I actually said was that a god(s) cannot be ruled out - in just the same way as orbiting teapots and invisible purple unicorns can't be ruled out.
Something that cannot be ruled out is not automatically a sensible, reasonable, or in any way credible idea. What is it that is so hard about this concept?
What would be irrational would be to try to investigate every single claim that cannot be ruled out - there isn't enough time in a human life. Further, it's not even as if there is only one god claim - people believe, and have believed, in
thousands of them.
Any one prepared to make the effort for multiverses and universe simulators has blown their arguments for not taking God seriously.
I'm not sure what effort you think I'm making. Simulated universes are science fiction. Multiverses cover a wide range of ideas from the simple infinite spacial extent of this universe (which has some inductive evidence) to pure guesswork (Tegmark's mathematical ideas).