So Christianity can be whatever we want it to be? No, Christianity is the belief that God sent his son Jesus to die on the cross, to forever pay for our sins (would help if you have some Historic background ((reading the old Testament))). John 3:16-For God so loved the world, that he GAVE his only son, that whoever believes in him, shall have eternal life. Now, there is more to this verse than meets the eye. First of all, God wanted to give us a second chance (more like an-millionth chance), he sent a deliverer and messiah (Jesus, his son) to guide people. Second, whoever repents of their sins will have eternal life (Christians cannot repent, and then do whatever they want ((Christians are actually held more accountable for sin than normal people are, because they profess to know how to change their evil ways thrue Christ))).