Christianity. It is something simple. Christianity is to have a belief in Christ. It is a belief in the words of the New Testament.
So then, why would it ever need be asked, "What is Christianity?"
In the world their are LDS believers, "Mormons" if you will. They live and worship around the globe. The official name of their religion is "The Church of Jesus Christ of Latter Day Saints." I am among this group of people. We all believe in Christ. We read the bible, and those with true faith turn to our Savior as our Reedemer and Salvation. In every sense of the term, we believe in Christ.
When I was around 8 I was informed, by a friend of mine, that I didn't believe in Christ. My young friend informed that my soul was in peril. I refuted her words saying, "I'm mormon. I believe in Christ. We all do." She looked at me and simply stated, "Well your not Christian... So my mom says your going to hell."
At age 8 I was confused. Believing in Christ and his purpose is the definition of Christianity. Thus, I was a Christian.
As I have grown I have become more able to say with certainty that I am a Christian. Yet, increasingly I have found that my non-mormon friends do not agree with me. Many times I have asked why, and increasingly I have found that... People don't know. They don't know why they consider Mormons "non-Christian." They just know they do. Many parroting, as my friend did, "My parents say!" Or, "My pastor told us."
I have learned to accept that Mormons aren't considered to be Christian, among many main stream christian sects. Leaving one fundamental thing to bug me. And that is, I am. I feel and know for myself that Christ is my Savior and Redeemer. Because of this faith, I wish to glorify him. I wish my actions to reflect his love, mercy, and example. I wish to lead others to Christ, and I wish my life to be a reflection of his. How though can others be led to Christ if they do not see me as a Christian?
Well... They can, if I have faith. I can live to glorify him, and pray that my works can reflect my Savior's glory. For it is through him, and him alone, that mankind may be saved. I can live hoping that my actions will speak louder then others learned notions. For if Christ is with me, his Spirit will testify.
No matter what teachings may cloud the human mind, the Holy Spirit can always point to truth, and to Christ.