What betrayal? You haven't been paying attention to the church if you think they have ever been against evolution. The catholic church has NEVER declared evolution in conflict with the faith.. in fact they have released edicts saying the exact opposite.
Evolution does not now, nor never has negated God. In fact evolution in all things is visible evidence of God's existence. Go read some St. Thomas Aquinas.
The church definately needs to get better at articulating its stands and getting the word out. I'd suggest every Catholic here watch "A life worth living" on EWTN at 9pm on Fridays... you will get more truth and logic and articulate message about the faith than probably anywhere else from the church in the last 40 years.
Originally broadcast on NETWORK TELEVISION believe it or not, for about 8 years, and a top show during that time, often beating out the other networks. You will find yourself enlightened and reaffirmed of things you already know to be true, but the church's message on them does not get out much in this secular society these days.