Who says they can't be friends with Non-Muslims? They are friends of the Roman Catholic Vatican. Indeed they are the children of the Roman Catholic Vatican. The history between the two prove it.
What is the agenda of the Roman Institution? To wipe out all bible believing Christians that reject the rule of the Pope over them. What is the agenda of Islam? To wipe out all Bible believing Christians. While it is true that there have been cases in recent history of them attacking Roman Churches - the payoff was that the Roman Church could appear to be the object of "Christian persecution" when the truth is - Catholicism is the enemy of Christ.
Surely some aspects of Catholicism are in spite of Christ's teachings, but enemy?
The apparent opulence and pomp exhibited by the catholic church does seem to be contradictory to Christ's teachings. Additionally, the catholic church's past history of involvement in crusades and political dealings certainly flies in the face of what I believe Christ taught.
Further the catholic church's crazy edict that the priests marry the church and be celibate... yeah that makes no sense at all to me and I don't see any basis for it.