Because there are divisions among the leadership of the churches. The chart in this thread shows an undivided church for more than a thousand years. That is not true. Far from it.

pasted from another thread: ...

The church has always been divided. Paul wrote to the Corinthians about divisions, that people were saying I belong to Cephus, or I to Paul, or I to Appolos, or I to Christ, saying Christ exists divided. -

1 Corinthians 1:12

Trying to make sense of twisted doctrine and tradition will only serve to confuse. I think that is why Paul said:

"...and so I, when I came to you, brothers, did not come with an extravagance of speech or of wisdom declaring the sacred secret of God to you. For I decided not to know anything among you except Jesus Christ, and him impaled. - 1 Corinthians 2:2-3

The bible is the preserved word of God. It's not a bunch of stories as some assert. It is full of prophesy for the future, not just historical record of the past. It contains the answers you seek. It is true and is no lie, and for those truly seeking, it is the annointing from God that is teaching you. - John 2:26-27

However, the truth found in the bible is examined spiritually:

"...physical men don’t recognize the Spirit of The God, because these are just foolishness to them and they can’t understand them, since such things can only be understood spiritually." 1 Corinthians 2:14

Keep on seeking friends.

“...ask and it will be given to you; seek and you will find; knock and the door will be opened to you" - Luke 11:9