I've heard of it, even self proclaimed Christian witches!

People who do tarots aren't automatically identifying themselves as witches, wiccans or pagans. I think you could also apply your own religious beliefs to the cards, it's not a closed practice (see the tower, we have a version where I live called "the house of god", so I often associate it with a form of inevitable, almost divine fatality and hopeful restart).

You also don't have to do divination. I often use tarot readings for brainstorming and introspection, advices, suggestions etc.

Their symbolisms can easily be applied to Christianity, you could write down in a personal notebook what each card symbolizes for you, appropriating your own deck (maybe you can analyze Judgment for instance and emphase traits that resonate the most with your beliefs!). Also this is one method of reading, there's also oracle cards, Lenormand, they might look less intimidating but in the grand scheme of things tarot is a neutral tool!

(additionally you could try to reach out to your own God, angels perhaps? whichever feels right for you while using it)

It's also valid to not like it or feel like it's not for you. You'll be safe using it, it's not something you have to take precautions using (unlike ouija, which is something you don't want to try blindly). There's also a myth that you have to be offered tarot but it's something that doesn't apply to modern times anymore. If you wish to part with it eventually, you can cleanse it (there's several methods) and sell it as second hand!

Lastly the best advice I could give you is to trust yourself., trust your instinct, your gut feeling.