well stu, you may know massive amounts more about science than me

I have a pet slug who knows a million times more about science than you do.

but I reckon I,m on pretty safe ground in my estimation of multiverse as being unobservable and untestable

Well now, most scientists on the planet regard the multiverse hypothesis as nothing more than just that. But pete, you hypocrite you, you can ignorantly pontificate about this whilst at the same time prattling on about your God, who is a million times more unobservable and untestable than any multiverse notion.

I had previously given a dictionary definition of religion, which covered atheism/evolutionism, hence the gentle jibe

Oh, "had" you really? Where is it then? And what dictionary, pray tell, included a mention of "evolutionism" in its "definition of religion"? Do try to curb the stupid lies, old chap.