It just strikes me as odd that people can be comfortable holding ideas and beliefs they know were basically forced upon their people. I suppose I can understand black people being Christians given that not all of the religion supported slavery or colonialism or forced conversion, but that it is actually higher suggests a sort of passive submissiveness among some black people as to the formation of their identities.
You are forgetting human nature.
When you are brought up believing in something and your parents were brought up believing in something and neither of you even experienced the rod that your grandparents felt while being forced to believe it it is easier to just accept it. They may have hated slavery, but conditioning from childhood sticks. Especially when they never experienced adverse effects themselves from that conditioning. If anything the conditioning is stronger because that original fear of punishment forced a strong belief, and to protect their children a similarly strong belief was instilled in them. Over the generations, that strength of belief has been propagated even though the original reason for it has been removed. (I would also like to point out that the previous mentioned points about churches being communities where they felt safe, and such are also applicable.)
To say that Africans should be anti-colonialism is rather silly. Did the colonial whites do a great disservice to Africans? Yes they did. However to denounce everything that came along with the colonists would mean regressing into a primitive tribalist race. Slavery sucked, but modern medicine, farming techniques and especially guns were all part of that slavery package. To abandon everything that came from the west just because those original colonists enslaved and degraded the people is ludicrous and wishful thinking.
You seem to think that freedom from slavery was based on a pure black on white hatred. While hate plays a part, the Africans desired freedom from slavery not because they hated their masters and everything they and their culture stood for, but because they wanted those luxuries for themselves, even if they had to oppress their fellow Africans to get it. This is evidenced all over post-colonial Africa and in particular Zimbabwe and South Africa. Politicians from African countries, like to use anti-west rhetoric to remain in power while at the very same time doing to their supporters the same indignities of the western colonists and enjoying the best luxuries that the west has to offer.