Is this something you just casually throw out, or do you have some data showing that... countries with greater religious divisions industrialized faster?
In any case, "built on the back of" seems overstating things. Find some sin in the past, and claim that it is the source of all the success of a country, for which it must feel eternally guilty. That there are similar, successful countries without this sin, or unsuccessful ones that share it, are details best ignored. E.g. slavery was widespread in Africa and the Ottoman Empire, with wildly different outcomes than in the US, and imperialism certainly wasn't unique to Europe or the US.