The big bang idea is bad physics and bad theology rolled into a package.
Not at all. The Big Bang theory doesn't attempt to explain why the bang occurred, only that it did occur.
When Lemaître, riffing off early work by Einstein postulated what came to be known as the Big Bang, he makes no attempts - and neither does anyone else that I'm aware - to speculate or hypothesis what (or who) may have been the impetus for the bang.