As a Christian, I do not call Jesus "God." He is the Son of God. The idea is that there are three forms of God: God the Father, His Son Jesus, and the Holy Spirit. I cannot pretend to completely understand the intricacies of the relationship of the three, but somethings are taken on faith. I have faith that I will wake in the morning, and the sun will be shining. There are no guarantees, but I take them on faith.
When I teach Sunday School, I tell my students that Jesus was sent in human form to walk with mankind and experience the existence of mankind. He was sacrificed to remove from us our sin. In the Old Testament, this was done by offering an animal as a sacrifice and burning the carcass on an alter. When Christ died, this was no longer necessary. My faith teaches us that we need only ask for forgiveness because Jesus was the ultimate sacrifice to make things right between man and God.
As with all religion, some things must be taken on faith. In a world of science, we can look to facts and compare them with ideas and judge whether the ideas are right or wrong, based on those facts.
Religion is based partially on facts. History books support some things in the Bible. However, the rest is taken on faith or not. It's not a question of right or wrong from a humanistic standpoint. We see the right and wrong of it as believers.
We make our choices and stick with them: as we do with love, art, politics, and everything else in the world. Never will everyone agree: even those within the same faith. Here it comes down to what you believe personally. What speaks to your heart has to be right for you; it does not have to be right with everyone else. It's a personal decision and a personal "journey." Not easy, but that is a long list...