I get it. Especially if there isn't anyone in your circle who identifies. My wife's cousin is bi and her boyfriend is trans and I'm really confused by the whole dynamic. Like, she wants to have a relationship with a "man" but this man isn't actually a man. As it was all getting explained to me I felt like I needed a pen and paper.I probably shouldn't but I'm going to jump into this real quickly...
My problem with using pronouns like he/him/they for someone that was born female is that, I think it causes me to lie to them because I think they're going through gender confusion and not actually born into the wrong body. Same for non-binary. If I confirm a falsehood for them then I don't think I'm doing them any favors or that I have strong evidence to back their claim.
This was well-understood until 5 minutes ago (more like 5+ years) and there's been no scientific breakthrough that's proven that to be false. You look at the explosion of LGBTQ identifying people by generation and it's clear there's a huge social/cultural component to all of this and not a biological one.
That's not to say that I shouldn't be respectful or understanding because they're certainly going through something that is very real but I think they're being misled. I would probably try to use their name as much as possible instead of pronouns.
Of course, as a Christian I think that God created them male or female, sent Jesus to redeem us through his blood, and the Holy Spirit to work through these types of issues with us.