Where ecclesiastical wineskins are bereft of new wine, the church becomes stale, lifeless. There may be order, but as British Anglican David Watson used to say often, it's the orderliness of the cemetery. The oyster may be there, but the pearl has gone. Enthusiasts' were sometimes people who had plenty of heat but not too much light. They got all excited about minor things.
Fanatics are enthusiastic, but such enthusiasm can sometimes lead to stupidity or even violence.
Paul said before he was a Christian he was zealous. We must search for the dividing line between enthusiasm and fanaticism - being inspired by God or the devil. A selfish church is like a glee club, existing for the benefit of its members rather than those outside it. So it is possible to become a Christian for the wrong reasons. Faith in Christ is not an insurance policy against 'the slings and arrows of outrageous fortune'.