[quote=UnendingEmpire]I think the best thing you can tell a born-again Christian is that this was how God - who apparently knows and controls - willed you to be, and that even if she has some issues with your identity, everyone gets those with people. It'd just be the simplest way to explain a complex thing like gender identity issues. "This is how God made you" and "What would Jesus do?", in addition to the fact that you're her child, should help her understand the right thing to do. If she disown you...well, that's not very Christian-like, tolerant, or motherly at all; a stark contrast to what you've said about her.[/quote]

Disclaimer: What I am about to say is not with the intention of making a religious debate. But rather to highlight something to avoid Dipper, someone I've grown to like to run blind into a potential war zone.

I think trying to take a positive twist with Christianity to help explain may in fact be a good way for Dipper to execute it, but depending on the kind of Christian she is.
If she's the casual "I believe in Jesus and God, but I don't bother with church or the Bible" like my Mom is than Dipper should be in the clear.
If she's big on the Bible however (In other words, either read it herself or goes to church and listens to her pastor a lot) this could very well be taken as blasphemy, and only make it worse for Dipper because he/she (I know Dippers trans, but Dipper never detailed which way so I don't know which abbreviation to use) is now both Trans, and speaking blasphemy and ill will of her God.

I mean, if your solution could work on all Christians then LGBT communities would have no issues being accepted. We would simply need to go "God made us gay" and be done with it. But because a lot of Christianity is homophobic (and the Bible sadly supports said homophobia) it's not that easy much of the time.

Basically, Dipper should take a look at what kind of Christian his/her mother is. If she's casual/relaxed it should be safe, if she's more fundamentalist it's probably safer to avoid trying to spin it on a religious note.

[quote=UnendingEmpire]the human mind is - despite how much research we've put into it - a complete and total mystery.[/quote]

“If our brains were simple enough for us to understand them, we'd be so simple that we couldn't.”
― Ian Stewart