I see mainly disagreements about biblical events such as what happens when you die, the rappture, the belief that you can earn salvation by good deeds, the meaning of scriptures etc.The divisions in corinth were obviously the fact that people were choosing to follow different leaders instead of the one true leader and head of the church, JESUS. Divisions today are caused by in my humble opinion, hardened hearts and inflated egos. People are determined to have things their own way which immediately breaks the first commandment.They create their own gods and therefore the most dangerous thing, " RELIGION" or denominations. The LORD never told us to do this and infact expressly forbids it in the commandments.We must all come together as one church, one gospel, one word, that of our LORD JESUS CHRIST who gave everything for us.