No there is nothing rational about religion. As argumentative as I am towards certain people it is your right, if you so wish, to believe in a deity, however if you apply any degree of critical thinking to it, he cannot exist and reading the contradictary messages in those books doesn't challenge that.
Cowtipper your arrogance, yet again is your undoing. The bible condones slavery
However, you may purchase male or female slaves from among the foreigners who live among you. You may also purchase the children of such resident foreigners, including those who have been born in your land. You may treat them as your property, passing them on to your children as a permanent inheritance. You may treat your slaves like this, but the people of Israel, your relatives, must never be treated this way. (Leviticus 25:44-46 NLT)
In 2006 the C of E apologised for the role it played in slavery in the Caribbean
When parliament voted compensation in 1833 - to former slave owners rather than the slaves themselves - the Archbishop of Canterbury received £8,823 8s 9d, about £500,000 in today's money, for the loss of slave labour on its Codrington plantation in Barbados. The Bishop of Exeter received even more, nearly £13,000. (From the Education Forum)
Slavery was abolished, by a combination of good people and economic neccessity. The church. if it played any part, was incidental.