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. 

 Science doesn't state anything without verification; no need to revert to 'supernatural' explanations for things that it cannot (yet) explain, like primitive man has done for so many years. I do like the humanitarian aspects of e.g. the Church but again, no need for supernaturalism. 

 Science cannot answer questions like “why am I here?” or “what is the meaning of life?” or “what should I do while I am here?”

These are firmly the domain of the philosophies and faith. There is nothing empirically observable about it. Science tells us what is, not why it is. 

 there simply is no 'why' or 'meaning' (why would there nees to be); don't worry about it 

 "The Science" is a religion. 

 no, the opposite 

 Do you not understand linguistics either? 

 you're grasping at straws