Comedy!

The really cool 500+ year old buildings in Europe and other places.

Medieval art and music.

Gospel music can be groovy.

Some would say, much of Western Civilization's art, music, literature and legal system. But that's a sort of "wag the dog" scenario that assumes these things would not have substantially, though not identically, evolved apart from the church's influence and that there were no other influences involved. Indeed, the church was so ubiquitous and powerful over the past thousand years that one should not fail to ask if these things evolved in spite of the church. Particularly in spite of the capital-C Church (Roman Catholic). Yes a lot of art has religious themes because it was produced by church patronage, but artists found ways to slip in subversive subtexts to get around it.

....ya got me...

For what purpose? There are way too many really bad things that they overshadow by far any positive thing.

I really do believe the teachings of Christ at their core are almost indistinguishable from secular humanism at its core. Be good to people.

Peace of mind? Believing that something good awaits you after death (whether that's friends/family/whatever you want) can make people more at ease about a loved one dying or dying themselves, especially if it's an unexpected death.

The one that always have been...... Nothing

They are reasonably nice to each other, every 25th of December!

Civilization!!!

This! Glory!