Christianity.
Founded on the life and teachings of Jesus Christ.
Read about it first hand in the Gospels of Matthew, Mark, Luke and John.
Read it from a Bible written in conversational English,
After praying in faith for God's Holy Spirit,
See if what you read about is different than what you were taught.
Then read it again a few times, from other translations.
See if what you read about continues to be different than what you were taught.
Now do the same with the whole New Testament.
Break out the concordances and commentaries to shed light on meaning and interpretation.
If you do so, you'll learn more than you now know about Christianity.
At some point, you'll need to decide to be a follower of one of the many Christian sects, or,
continue to read and research, and most importantly practice, Christianity outside one of the many Christian sects.
I chose the latter.
Online sources:
http://www.catholic.net/RCC/Catechism/bible.html
http://www.ntgateway.com/bible.htm
BA- Good luck.
PS- It's a journey, not a destination.
And we know Jesus existed how? Don't use the bible or tainted works from Josephus...