For a "neutered, tired religion", it sure seems to be breeding prolifically. It is the fastest growing religion on earth currently and is taking China and Russia by storm.
Once, it was like Islam is now, full of fire and passion and global conquest, but now is nothing more than memories.
You mistake Government with Religion. The conquest of Christianity you refer to was the use of the religion as a shield for mans conquest. When the Bible was printed for all to read, that put a stop to it.
I don't really mind, either. The glory of European civilization came from the pagan parts- Rome and Greece, and their rebirth and rejection of Christianity in the Renaissance and Enlightenment .
Perhaps Christianity has been neutered in your heart, but as Aristotle said, "The function of the brain is to lubricate the nose." Romanticizing the past has its place, but reality is a concept too. I kinda think America and Modern Europe, built on the foundation of Christianity has surpassed the toga party and the mad max entertainment business of the ancient world.
What is actually going on is the drawing up of the sides of the battle of Armageddon. You wish to hang with the tree worshipers and the child sacrifice types, I want to hang with the Almighty God. So be it. A man has to do what a man has to do, and eat the consequences of his choices.