So, yes, I am a believer in Theistic Evolution especially since it is not prohibited by the Church.
Sometimes I wish I wasn't right about everything all the time.
All I can say to you is, that "Theistic Evolution" was a fad of the 1950's that was understandable at the time. You have to understand that Evolution hit the scene like a ton of bricks, and scientists promoting it were gutsy and bold (as they are today) only people back then were more decent and humble as a whole. So they had respect for the scientists and deferred to their learning. People were more naive and trusting back then.
So when faced with the "apparent evidence" for Evolution, all Christians (including Catholics) could do was say, "Well, if things did evolve over millions of years, all I can tell you is that God must have sparked the Big Bang, and He also intervened to create Man, since the doctrine of Original Sin says that we all came from one first couple."
But talk to the Protestants at Answers in Genesis (Youtube channel) -- they will tell you the problems with Theistic Evolution. For one, DEATH IS DUE TO SIN. But in Evolution, you had eons of death, cancer, dog-eat-dog, law of the jungle BEFORE Man was even created. Death was a fact of life LONG before the first Man was created, nevermind when he ate the apple. So that goes directly against Scripture and Catholic teaching.
Plus Genesis teaches that God made everything in 6 days. There are various "theories" how to do mental somersaults and resolve the obvious conflict -- but they don't work. The Hebrew word used (yom), with the surrounding context/sentence, can ONLY MEAN A 24-HOUR DAY. The protties behind Answers in Genesis are 100% correct on this particular point.
Today there is no excuse for Theistic Evolution. Evolution is garbage. They haven't found ANY transitional fossils, there is NO evidence that it's even possible, much less that it happened. We now know about DNA and the inside of the cell -- no way that could have developed over millions of years by blind chance. And that is what evolution teaches, that blind chance + time can achieve anything. Saying God started the ball rolling with the Big Bang isn't enough. It simply isn't possible. New features or information -- designs -- never get created by chance and blind luck.
It would be like finding a fully functional CAR in the middle of the woods, and thinking that a man or men weren't involved in its creation. Or having a factory explosion that accidentally assembled a fully functional 747 jumbo jet.
Evolution is absolute madness.