Crusaders

Crusaders are clerics first and warriors second. So if this is true, then why aren't clerics allowed to be crusaders?

Think of them as martial priests, not people that idly call upon their god to do the their own work.

aka

Crusaders do the work of their god, rather than the other way around (clerics)

Aside from that, Crusaders are also vicious warriors. (Hence Berserkers can join)

They learn to be "Priests First" most panzy *** clerics can't become as horribly vicious as a 'sader.