You are exactly right. God created Einsteinian spacetime and is not constrained by those puny four dimensions. Having a "beginning" is a spacetime concept.

It is pointless for science to speculate about what lies outside that because the only way to know is if it is revealed to us from outside.

This has happened, but most would prefer to deny it because it means giving up being in charge of their own fate.

But there are things much better than that that they will lose by doing so.