I have know plenty of educated people - scientists even - who are devoutly religious.
I think to some extent there is a perception among some secularists that the devout Christian thinks the bible is literal history. Jonah actually lived in the belly of a whale, the Earth is 6000 years old, et al.
I am pretty sure that kind of literalism is pretty much limited to strains of evangelical Protestantism. I certainly personally never experience that kind of Biblical literalism and rejection of evolution in Eastern Orthodoxy, Catholocism, or mainline Protestantism. So in some respects, I think it is unfair to paint all Christians as the type of frequent the Creation Science Museum, or the Noah's Ark Experience theme park.
At it's best, religion to me is a philosophical tradition that guides our choices. I mean, this goes back to Zoroaster, Buddha, Confucius, Jesus, Muhammad, et al. So, at it's bare essence, they are collectively universal philosophical traditions rooted in the Axial Age - traditions who hold to the premise that we all have to make a choice to stay on the path of righteousness or not, and we all are responsible for our moral choices and the consequences that come with them. And that ultimately determines the purity of our souls.
One could argue all day about whether Johan actually lived in the belly of a whale, but I cannot argue with or make fun of the philosophical traditions the buttress the world's major religions at their best.