Are Religious Countries More Likely to be Poor?

I have pondered on this all my life, but I think about this more these days. Are religious countries more likely to be poor? Why do we have the most churches, the biggest churches, and the most prolific pastors in the world in our dear country, Nigeria, and yet a large portion of our population languish in poverty? While a country like France which has majorly atheists citizens is so beautiful and well developed, with inhabitants living way above poverty level. Why? Is it that 'God' prefers to bless the non-religious people, living the religious people to suffer? I know a lot of religious people that follow all the doctrines in the Bible, and yet are as poor as church rats. But the richest man in the world, Bill Gates an Atheist? Why?