Christians, Why must we be divided?!?

Too many humans have decided what they think the Bible means, and not all "Christians" agree. I also believe that Mary is Jesus' mother, but I don't pray to her, or think she has any special power. She is not a god. There are too many differences between denominations for everyone to agree. I think we all just need to agree that the Bible is God's word and Jesus is His son, and we'll be fine.