The Christian Right film Amazing Grace was being promoted to libertarians, no doubt with funds from some Christian source. The promotion says the film is about about William Wilberforce and his effort to get England to abolish slavery, as well as his relationships with evangelist George Whitfield and John Newton. The film is named after the words of the hymn Amazing Grace, which Newton wrote.
Now, for some inconvenient facts. Wilberforce was not the first to call for abolition of slavery. Deists like Jefferson and the Quakers, who are not orthodox Christians by any means, were there first. Nor was England the first country to abolish slavery. Revolutionary France, considered godless by the orthodox Christians, had abolished slavery in 1794, but Napoleon, an orthodox Christian and opponent of deism, restored it when he took power.