You know, Susanna, I have tried answering questions less complexed than this, and Hubpages wouldn't allow my answer because they said it was too long and suggested I write a Hub instead. I ended up erasing half of it just to get it in.
Wow, you talk about a loaded question! Girl, you have no idea what you are asking for. :0)
I'll never get it all in, but before I begin I should preface what I am about to say by stating that believing in a "god" is not the same as believing in Christ Jesus, nor is believing in a "Creator" the same as being a "Christian". Believing in a Creator does not necessarily lead one to Christ, although it is a prerequisite.
Having said that, I will skip over the whole question of why I believe in a "Creator" and begin to answer the question of why I believe Jesus is the Christ, knowing that time and space will not allow for such a monumental undertaking.
I will also have to skip over the monumental question of why I believe the Bible is the inspired Word of God, but will only stop long enough to say that dozens of writers, most of whom never met each other, but echoed the same story-line over the course of 1,600 years, is rather impressive.
Now that I am out of time and space, I may have just enough space to say that when one examines the Holy Bible in its entirety and reads the accounts of Christ's life in conjunction with the historical perspective and prophesies of the Old Testament, it is clear that one man fits the bill completely...and history only has one such man that fulfills ALL these prophesies and His name is Chirst Yeshua (Jesus), the only begotton Son of God.