Mysterion is an anthology looking for religious science fiction, fantasy and horror, specifically focussing on ‘Christian themes, characters, or cosmology’. It sounds challenging and interesting, and it’s a pro-paying market:
The story must engage with Christianity. We want stories with Christian characters whose faith affects their actions, with Christian themes such as grace and redemption, or with a Christian view of the supernatural. Note that we’re not saying that you must be a Christian. We are not in a position to judge your faith, and won’t try. Nor does your story need to be unambiguously pro-Christian. If you can tell a good story that meaningfully engages with Christianity, we want to read it.
They are paying 6c/word for original submission up to 10,000 words, and 3c/word for reprints, and are open until Christmas, so get submitting!
Literarium listing here: https://literarium.net/market/mysterion/mysterion