A question to the religious: do your heart and head work together when it comes to your faith?

Firstly I want to beg you all not to turn this into a theist vs atheist arguement.

Secondly, and more to the point of my question, for the religious or believers in a higher being of some sort do you ever find that your heart and your head differ in opinion on this subject? I will happily admit that I believe in a higher being, my heart is comfortable with this. However, my head and my mind is fascinated with the science behind the earth and everything that lives and thrives on earth. I don’t believe in creationism in the way that I have heard most Christians teach it but that doesn’t mean that I don’t believe that a God or higher being had something to do with why we are here. To be honest, despite the fact that I know I believe in something I can’t claim to have all the answers here!

Are your heart and head at one with each other when it comes to your beliefs or do they differ a little like mine? How does this mke you feel about your faith?