Shannonkish is ginving you good advice. If you are going to persue being a pastor, you should get a bachelor's degree and then go on to seminary. You have to get that degree in something.
To study economics does not mean that you have to attend a non-Christian college. Many Christian colleges offer degrees in economics. (Check out
www.cccu.org for a great list of schools.) You could double major in Bible, if you wished, or another field that would be useful in ministry - anything from psychology to business management to organizational leadership. I have also known great pastors who studied engineering, mathametics, drama - you name it!
If God has given you a passion and interest in a field of study, it is there in your life for a reason. YOu may have no idea what yet, but don't dismiss God given interests.
The demands upon pastors vary greatly depending upon where they serve and the members of their congregation. I have a friend who is an assistant pastor at a church in the shadow of several major universities. Undergrad and graduate students, faculty members and administrators populate the congregation and are frequent visitors. A pastor who would say "I don't need to understand the Bible, I just need to know that God said it and believe it!" will have no effective ministry in that community. The fact that she has a PhD as well as an MDiv is important to her work there.
Since you have no idea where God is calling you to serve yet or what the exact nature of your inistry will be, give yourself as braod a taining and background as you can get. And don't forget - even at a non-Christian university, there are Christian faculty and students. My daughter is studying in an area that no Christian college offers degrees in.Yes, she's with a lot of non-Christian students and all that that means, but she has made great Christian friends, found Christian faculty members and a dean or two. See what path God calls you to.