There are about 34,000 different Christian groups in the world since AD 30. This is according to the World Christian Encyclopedia published in 2001. 1,200 different Christian denominations exist in the United States alone. Some groups classify Christianity into 8 meta-groups, namely Roman Catholicism (the largest), Eastern Orthodoxy, Oriental Orthodoxy and Assyrian Churches, Protestantism, Restorationism, Anglican Communicants, Pentecostal, and others.
Christianity has become so commoditized that one can't tell the difference between them. It is supposed to be one group and no differences between them.
And no need for a FDS to keep everyone united and not divided.