One key thing about Christianity is that it requires voluntary acceptance of faith. (religion.blogs.cnn.com)
Initially, it was only able to do so through a one - way voluntary acceptance of EU ETS allowances to meet its own trading system's obligations, but joined fully in 2008, once the European Commission had accepted its proposals for a cap and allocation of allowances. (lawyer-monthly.com)
Along with the political reconquest went a gradual conversion to Christianity, some of it by force or thinly disguised force, but much of it as a voluntary acceptance of the faith of the ruling classes. (religion-online.org)