What changes in History would need to come to pass so that in 2019, most European countries are at least as religious as the Southern States of the USA?
For example, LGBT rights are rejected in favor of a Biblical interpretation of sexuality, and the duty men and women must fulfill, there is a widespread network of pastors and priests who actively try to wean young boys and girls off masturbation, and there is a general sense that Heavenly rewards are more important than Earthly goals.