There are many reasons. Science has its limits. There are things it cannot explain, and I believe that to be the role of religion. Further, I was convinced as a skeptic based upon historical records and the elegance and logic of the teachings as far as my specific faith is concerned.

The Church has a huge corpus of teachings written over the course of 2000 years. Great minds like Thomas Aquinas. The Church is also a patron and contributor to science - the father of the Big Bang Theory was a Catholic priest (Fr. Georges Lemaître) and even now, the church operates one of the best observatories in the world. Hardly a primitive Church imo.

How can man outgrow God? I’m not so certain we are all that powerful. I’ve seen little evidence of mankind’s ability to live well without him.