I recently read a helpful little book entitled Love and Nonresistance: God's Plan for the Church. The author, John Coblentz, looks at Old Testament foundations and New Testament principles that must guide our decision making. Using scripture as his basis of authority, he deals with issues such as warfare in the OT, nonresistance in both the OT and NT, and the separation of church and state.
The most helpful chapter for me focuses on the difference between nonresistance and pacifism. The author writes that pacifism is actually nonviolent resistance. This is significantly different from nonresistance. I had never thought about the difference before. Coblentz suggests that the bible models and teaches a life of nonresistance on the part of the Christian.
I'm still working through these issues. This book was helpful in this path I'm walking. I recommend it highly. You can order it here or here. Enjoy.