I agree with a lot of this except for
Mathematically and historically, almost all mainstream religions are false. Or, rather, their supernatural concepts cannot exist if you rely on the texts alone
The latter part excuses the first I guess, but it's still a very big statement. You can't disprove the supernatural with mathematics, because by definition the supernatural can defy the scientific laws we know. As for history, many religions are false, yes. But a few of the more popularly believed ones don't contradict history by all accounts I've seen and read.
and I also disagree with this
Homoloveuality isn't a choice (based on biology that isn't homegrown speculation). Chromosomal mutations/hormonal preferences aren't magically warped by mental power.
I'm not saying I know for a fact why they are the way they are, but I wouldn't go so far as to say beyond a shadow of a doubt that it isn't a choice- or maybe it would be better to say that it's something you have control over rather than to say it's strictly a conscious choice. In everything I've ever heard and read about the debate, scientists have never found a gene that affects which love you're attracted to. And this is backed up by the fact that Jason Collins, a Basketball player, came out and said he's gay; but he's also an identical twin to someone who is straight as can be. They have the exact same set of genes.
In other words, almost all monotheistic religions are based on polytheistic beliefs.
I'd say it's the other way around, but that's an entirely different argument. For that we'd have to know for a fact which religion came first and that's just not something we can ever really know beyond reasonable doubt