List all differences between Catholicism and Christianity?

Catholicism is a kind of Christianity, but there are differences between Catholicism and protestant denominations. In the catholic church, priests cannot marry, women cannot become priests (they become nuns), and there is more of an emphasis on praying to Mary and the saints. The catholic church is also much older than the protestant church. There are actually a lot of similarities, though, too (same holidays, a belief in God and Jesus as his Son, services every Sunday).