It doesn't SUUUUPER matter, like, nobody's gonna come in and be like THIS ISN'T THE RIGHT GENRE, YOU'RE FIRED or anything!
There isn't a genre option that's representative of what your comic seems to be trying to do, but I'd think with what you have up now, either Fantasy or Action would be the closest match (esp considering the snake fight (action), and the fact that the Bible stories have been embellished(fantasy)).
If it were me, I'd probably go with Action -- people who are looking for a Fantasy comic are looking for something different, and anyone who's interested in a more exciting take on Bible stories explored genuinely might be turned off by a Fantasy label. I don't know your personal feelings about the Bible, but if you feel weird putting Bible stories under "Fantasy" then go ahead and use Action! If you feel like Action is a bad match because you don't plan to tell many Bible stories that have big action in them and you're okay with Fantasy, go ahead and use Fantasy!
It's really not a big deal -- I almost never look at genre when finding new comics! So whatever you are comfortable with is fine!