I'm not even a Christian, as most of the revere (mark on the forehead) and/or obey (mark on the right hand) the Pope, which is exactly why I stopped that.
Just reading and following the Scriptures is all you need, really. Also, the feasts, lunar Sabbath, and anything else in the Torah that doesn't require a physical temple (because we can't have one right now, even if it's being built under Catholic pretenses) and/or we be in Jesrusalem (for the land is filled to the brim with evil) is a requirement. That, after all, is our instruction manual (including the teaching of Messiah, which contradict Christianity).