Ramus cares about himself first and foremost. His allies come second and only because he needs them to accomplish things he can't do himself, admitting that he needs help is something he would never do openly.
Ramus is in search of power, riches are one form of power. He wants to be a name on the tip of everyone's lips of the glory of Ramus Cornelius Krill and all his done. He is not evil, I'd say he was neutral if anything, he will do good and evil if it helps him gets what he wants.
He believes that there is power that comes from the tower, whether he believes in the details of religion are another. Ramus does not like the bureaucracy, hypocrisy and evil he sees with the structures of organized religion.