Actually you're half right... Jesus = 100% man
But nowhere in the book does it state he's equal with the big G as also being 100% god.
During the 5th century, the catholic church, or more accurately Emperor Constantine (a pagan by the way) made the decision to elevate Jesus to the status of god... a few years later, a similar decision was made about the holy spirit... thus forming the "trinity"
The word "trinity" isnt mentioned in the bible because it's made up....
But that's off topic...