it is true that lot of time devoted to a particular vocation distracts from being a more well rounded individual.
Success is a personal goal. defined by each individual.
Success is related more to opportunity/positioning and social network than to any particular belief system or lack thereof.
lip service faith is often a veneer.
smarter does not mean less gullible or measure the tendency to go with the social crowd

Success, value, intelligence and goals are not necessarily related

Different people have different aptitudes and inclinations. Natural selection acts on variation, after all, and with 100 billion synapses each, there's bound to be a lot of variation in the brain. I have a fairly high IQ, but I can't drive very well. Guess I'm not that smart after all!

I don’t think of it as smarter, I think of it as more logical. The amount of knowledge one possesses, is not dependent on the ability to use said knowledge.

There are many kinds of intelligence. There is formal, adaptive, creative, social, musical, intuitive, environmental, and the list goes on.

Most people excel in one to four with a few exceptions. They are mediocre in most and uneducated in the rest.

Most people were brought up with religion. Go to any small town and count the churches, then imagine how many in big cities. Churches provide a function to the community they serve. Rummage sales, senior suppers, potluck suppers, Bingo, and a host of other activities.
Many businesses are involved in church activities such as charities and fundraising which are beneficial to the businesses. Networking is important in business.

As for Atheists and Agnostics being smart...We made a choice, we had questions that could not be answered and we chose to let religion go. That is one aspect of our lives and for us a smart move but does that make us smarter than anyone else? Not that alone.

I think you're mistaking intellect as the only factor in success. There are successful people from all walks of life, and even though a high IQ and a good education certainly helps, that's not the be all in determining wealth, family, etc. Social skills, communication, perseverance, and myriad other traits all factor into how successful we are. And a degree of luck is involved, too.

And don't underestimate the power of community to make success easier for people. Churches are communities; they are social networks that people can tap and leverage for business and support.

Even people who are very bright can delude themselves. Happens every day.