Hi Holly - Gertabelle gave some great advice here. I agree there are two things important in this situation - prayer and genuine love. (FYI - people that I have personally known who were transgender were also gay, which I mention because you don’t say whether or not this person is, or whether they are biologically male or female. If this is a woman who is gay, then be careful in reaching out not to give the wrong impression of your intentions, since that would only create more problems for you both.)
Pray for this person, pray for opportunities to show them the love of God in tangible ways, pray for the opportunities to verbally share what you believe and why in a natural comfortable way and let the Holy Spirit lead you. Sometimes the person who seems to be the most disinterested in the gospel is the one who has been most desperate for the Lord to reach out to them, I have found. You just never know what God might be up to in the situation!
Christians who believe in sin, Jesus and atonement for sin, and orthodox Christianity - whether Protestant or Catholic - have not always gotten the whole “hate the sin, love the sinner” thing down very well. As a matter of fact, we’ve often handled it badly… either we throw in the moral towel and accept it all, as society does more and more, or we get pretty nasty to the folks who need God and the hope only He can give. So, as Gertabelle says, it’s possible the only experience this person may have had with any religion that subscribes to scriptural, moral teaching might cause them to be pretty defensive. That’s why prayer for them, and simple respect and kindness are important. If the Lord prepares the way, and you have been a good friend, your words will be listened to even if not immediately agreed with. Your job might be to plant the seed that causes this person to start wondering if things could be different with God.in their life. Conversion of heart is a process.
I’m sorry this got so long. One of the causes close to my heart…I’ll be praying for you.