The difference is that scientific models of gender are naturalistic (they follow typical scientific principles), and religious models are not. I think the naturalistic view of the world is objectively the best view of the world.
"The first and fundamental principle of our holy religion is, that we believe that we have a right to embrace all, and every item of truth, without limitation or without being circumscribed or prohibited by the creeds or superstitious notions of men, or by the dominations of one another, when that truth is clearly demonstrated to our minds, and we have the highest degree of evidence of the same.”
I would like this to be my last response. I don't want to endlessly debate or make you feel like you need to endlessly respond. If you would like to respond with some links to the evidence that supports a complex model of gender as being more in line with reality, I'd be happy to take a look (without responding, of course, with my opinion on that evidence).