I think people confuse Christian past with actually being Christian. In Poland about 50% of people attend mass every Sunday. In Germany that's 7%.

It's still tradition in Poland to have a priest visit your home once a year to do some magic, every child gets baptized in church, 75,6% of kids attend religion classes at school because yes, religion is still part of curriculum in public schools. Abortion is illegal, there's no civil unions let alone same-sex marriage, no no-fault divorce, no euthanasia or even legally recognized DNRs.

That's a Christian country. Germany just has some Christian traditions.