I think a big difference is that where Catholics tend to spend a lot of time focusing on matters of conscience, with the need for regular confession, strains of guilt, and a fearful respect for a God who don't suffer no bullshit when he knows what was in your heart at the time, other strains of Christianity have bypassed that into the theory that sudden "re-baptisms" suddenly wash the slate clean, and that you can flaunt your "blessings" as victories and signs of God's approval.
I think the difference between evangelical Christians and other Christian faiths is that the others have a deeper history to contemplate from. For example, what history does Joel Osteen's mega-church have? What's the 700 Club have behind Pat Robertson?
I grew up with a healthy skepticism of religion, thanks to Lisa Simpson. But I also grew up with a healthy individual of faith: my father. He always went to church, and still does go every day. Still married to my mother. This is despite the fact that, as far as I know, he has always been gay.
Faith is a funny thing.
With Pope Francis, I feel as if the Catholic Church is turning a corner and coming back in line with the core of Jesus' teachings: be good to others; love your neighbors; turn the other cheek; sit with sinners; be charitable to the less fortunate. Maybe his continued influence will cause some of the barriers to break further, but we'll see.