The mind is a part of the soul. Since we were created in the image of God, all the faculties of that image are good. A Christian is not someone who checks their brains out at the door when they enter the church. We are commanded to love the Lord with all of our minds. The Lord has asked us to be thinking Christians.
It was Ravi Zacharias who said, “After all, it is not that I think, therefore, I am, but rather, the Great I AM has asked us to think, and therefore we must. And we must serve Him with all our minds.”