If you're trying to say that Christendom was great during the Crusades, you have some cognitive dissonance to get out of your system.

Crusades are in direct conflict with Christ's teaching to "love your neighbor".

There is no valid Holy War.

There is no valid Holy Violence.

Glorifying Crusaders is high hypocrisy.

If you want to make Christendom great again, that's going to require that individual Christians get over their attachments and go explore every religion looking for the connections that are common to them.

That's not likely to happen though because most people operate from their ego, not from their hearts.