Hello, friendly neighborhood atheist here. Just wanted to offer some perspective from the other side of the spectrum. Something I have found is that people who have a strong sense of faith and also belong to a Christian religion, well they can have some major blind spots when communicating with people not of their religion. Stuff like assuming that your faith necessarily virtue signals that you are a good, safe, trustworthy person. While organized religions are responsible for doing a lot of good acts, they’re also responsible for causing a lot of harm. The people who are loudest about their faith also seem to be the ones that do the most hurting. It really doesn’t matter what your intentions are, when you come on strong re your faith it can feel aggressive to someone not of that faith. For example, we had a head TA my 2nd year who, when introducing herself to the class, identified herself as a daughter of Jesus Christ and I immediately recoiled. She might have been a super lovely and helpful person, but that introduction meant I was never going to go to her for help (being on the lower rung in the power dynamic) because I’ve experienced too many, just, awful interactions with people who talk about their faith like this. So like, can you talk about your faith in an essay? Sure, but unless everyone on the admissions committee is a part of your “in group”, making it the central theme of your essay is really risky imho. If I were the one reading that essay, my reaction would be so you’re a Christian, that’s great for you, but so what?* Actions speak so much louder than words, what have you actually done that will show me you’re a good human? Keep in mind too that there are a lot of religious groups currently actively causing harm to the medical care of women and the lgbtq+ community.
Once you have a draft of your essay maybe ask some friends who are athiests, or at the very least not Christian, to read through it and give you honest feedback about how you come across. If you can’t think of anyone who can be that person for you, I would take that as a sign that you’re fairly encapsulated within a cultural bubble, meaning you might need to do some extra legwork to find those blind spots. If it’s just a sentence of here’s where I started, and the rest of the essay is here’s what I’ve done with it, you might be fine.
*Just to be clear here, I would not hold a bias against someone for having their faith be a big part of their life. It is important, however, as a physician (and a medical student!) to be able to read the room.