If anything is black and white, or gray, it is Roman Catholicism.
Rather than leaving good evangelical churches due to deeper love of Jesus (a wonderful sentiment though) to find “full color” in Roman Catholicism, the opposite is what is most manifest.
As with me about 30 years ago, most evangelical converts from Rome left due to the spiritual deficiency of Rome, and not for an easier conservative faith, as Rome overall is more liberal. See http://www.peacebyjesus.com/RC-Stats_vs._Evang.html
And such churches abound with converts from Roman Catholicism who manifestly did not know the new birth, resulting in a Scripture-based relationship with the Lord in living color. They do need to learn more theologically and from history though, and the evangelical church has its own remnant out of necessity.
Meanwhile, i have heard Catholic priests rejoice at how converts from evangelical churches, the relative few there are, enliven their pews. As my old priest used to exhort us, “sing like Protestants.”
As for the prosperity gospel, that is not the majority, thank God, and is a result of conforming to the culture which is evident in both faiths, while the strongest “faith Christians” are those in the persecuted church. For faith not only can see escape from the sword, but enable us to be sawn asunder. (Heb. 11:34,37)
I rejoice with the spread of The Gospel. The Christian evangelism sweeping south and central America is so exciting. It's exciting first and foremost because so many are coming to know the Lord as their Savior. Also, from a political perspective the stronger the Evangelical Christian influence in this region of the world the less likely it is to fall into socialism and state control of people. I think of these people as our neighbors down the street and not only want to see them saved, but want to get along well with them.
Sadly, it indeed is. Amongst evangelicals and pentecostals it is the defining characteristic. Anyone who has thrown off or abandoned the cross has embraced the "prosperity gospel". Anyone who embraces Jesus for any other reason than taking up their cross and following Him to Calvary has embraced the "prosperity gospel".
The "prosperity gospel" encompasses much more than the "Jesus will make you successful" shtick espoused by preachers like Osteen. It is also comfortable Christianity, devoid of suffering, which is embraced for the buzz or the high which many claim it brings. It is Christianity which punches one's complimentary ticket to heaven in air-conditioned comfort. It is the "I'm saved......Jesus is my personal Savior" Christianity which costs nothing more than an inner gut feeling that I'm going to heaven.
All this is the "prosperity gospel". Jesus is making you "prosperous", whether in this world or the next.
This is precisely where the "prosperity gospel" has its heretical roots. You are at the center and Jesus is supplying your needs at no cost to you.