Differences

I'm a Christian but I was raised protestant. There are so many things about other religions, even different versions of Christianity that I don't know. For instance, I know very little about the Catholic way of doing things. What are rosaries even for? At one point I was at a wedding at a Catholic church and many of the rituals seemed very foreign to me. It's just so interesting to me that we could serve the same God in such completely different ways.