According to the NT, shouldn't Christianity be one? Shouldn't there be only one version of Christianity (regarding doctrines and regarding practices claimed to be required by God), instead of the numerous divisions we find in Christianity? Didn't the gospels (at least one gospel) say that Jesus told his disciples that they should be one just as "I and the father are one"? Doesn't the NT say that God is a god of order instead of disorder/chaos? Doesn't truth matter? Doesn't truth really really matter? If the Bible is true, doesn't there exist a God of Christianity who communicates very clearly to all of his followers/believers? Didn't a gospel account (the one named John) say that Jesus would send the holy spirit (also called the spirit of truth) to provide correct understanding to all disciples of Christ who request to receive such?
Since by etymology the word "theology" literally means "science of God/god" and "knowledge of God/god" (and "study of God/god") shouldn't Christianity theology be a true science, an actual branch of science? But Christian theology is not a real science, not a real branch of science [people study human ideas about God instead of studying God/god himself/herself/itself/themselves]. Shouldn't God/god be an entity which humans can directly study if theology is really a study of God and a science of God?
Why don't all Christian theologians, especially those who are scholars of such, agree with each other on all matters of doctrine? Why are some them Catholics, some Orthodox, some Lutheran, some Presbyterian, some Methodist, some Baptist, some evangelical, some Episcopalian, some Seventh-day Adventist, etc? Why are of some them atheist or deist or agnostic?