Religious people, why was religion used as a tool for segregation if it's supposed to bring people together?

The Christian so-called faith has always rested on the support of slavery and bigotry. From being the preferred cult of that slave empire Rome, thru the feudalism serf age, into colonism and modern slavery.

When the Christian faith saw a man holding a whip and another on the ground for 20 centuries they faltered and apologized for the man holding the whip over his victims.

The Holy Catholic Church is the most diverse group of people on the planet, with over a billion members of virtually every race, nationality and political persuasion, united in worshiping the one, true God of all creation. Membership remains free to all, as are all the associated, temporal and eternal benefits. With very few exceptions, it has been that way ever since Jesus Christ personally founded the Holy Catholic Church, over 2,000 years ago. 

Any port in a storm, I guess.  Religion, true religion, does not divide people.  It tries to unite them.

Genesis 11:Now all the earth continued to be of one language and of one set of words. 2 As they traveled eastward, they discovered a valley plain in the land of Shiʹnar, and they began dwelling there. 3 Then they said to one another: “Come! Let us make bricks and bake them with fire.” So they used bricks instead of stone, and bitumen as mortar. 4 They now said: “Come! Let us build a city for ourselves and a tower with its top in the heavens, and let us make a celebrated name for ourselves, so that we will not be scattered over the entire face of the earth.” 

Evangelical Christians didn't end slavery in America. Ha, ha, ha. Quakers, Unitarians, Baptists, (not Southern), AME, were the religious players in the ending of slavery.

William Wilberforce, the English evangelical Anglican politician and philanthropist, was highly prominent in ending it in England and colonies. Of course the wealth Wilberforce accumulated to be able to be a politician and a philanthropist came from his business of slave trading.

Only one person was a major player in ending slavery in the U.S., the non-religious,  liberal Republican who believed there existed an all powerful entity that shaped events.

false teachers, satanic doctrines, doctrines of devils, misunderstanding 

The Pope is trying his hardest to unite all religions because his logic is if there is only one god then you only need one religion.. Surprisingly his biggest opponents are his own clergy who are pointing the finger of accusation against him for breaking with tradition ..but are more than happy to hold the other hand out for a free meal ticket..

Tools can be misused.