Makes sense. That has been the viewpoint of historical protestants and many gnostics. Although... eh, I better not start a rant on the Protestants. They don't know who they are... They've lost their connection to history. Ehhhhh stahp, self, no rant.
Discussion
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).
How do you define a Christian, and what about you excludes you from it? If its only the approval of other Christians, I say it is of no concern. In fact, Jesus says explicitly that he will not recognize most of the people who think they follow him. Their approval is the least of your concerns, if you care about what the Bible actually says and what Jesus actually taught.