The truth of the matter is, religion or christianity has nothing to do with religion. Because, the Bible was written for mankind to follow and obey God's law, the Bible. So, thus, religion or christianity is not base on philosophies.
I think Christianity is inherently a religion, but it's like an overarching super religion. You can't be just a general Christian in the same way you can't just be a general art major. There is literally no such thing. You have fine art, graphic design, photography, film, sculptor....ect. You do one of those thigns, or a combination fo some of them, but there's no general art major.
Just like if you're christian you're either Roman Catholic, Eastern Orthodox, or some kind of Protestant (I can't even keep track of all of them any more THERE ARE SO MANY).
True enough bu Protestantism is like it's own super-religion. How many sects are they up to now?....and I don't remember if Mormonism is it's own thing away from Protestantism or if it's part of that along with all the others