There are a lot of 'ifs' there, Paul. First, some thoughts on the first point:

"1) before there was something there was nothing"

True if there was a 'before', and on condition that there could be time without spatial content.
False if there wasn't a 'before', or if there was an infinite time 'before' that always contained something.

Maybe the very first "something" existed in the very first "time", in which case there would be no "before".

Alternatively, maybe there has always been something - maybe our universe arose from an infinite continuum that existed prior to the Big Bang.

"Time is what prevents everything from happening at once" - John Wheeler