Bible studies or Theology major? Which should I pick?

I'm looking to become a pastor/minister. I'm going to be double majoring in psychology so I can both help my congregation and possibly move into christian counseling, secular counseling with a christian spirit behind it, and/or research psychology. My first priority is to serve the Lord, but I'm not sure which major I should pursue to get where I'm going. I vaguely understand the difference between Theology and Bible Studies, but am not completely sure that I really get it. I'm also hoping to move on to a Doctorate in Divinity as well as a Ph.D in Psych. Is one major better than another for a D.D.? I'd appreciate any responses, advice on either pursuing my vocation as a pastor or being a Christian Studies major (especially as part of a double major).