Father's permission in marriage: Obligatory or not?

Q: My name is `Abdul Kadder and I am twenty five years old. I want to marry a twenty five year old Christian woman whom I promised to marry if she embraced Islam. Should I marry her after she became a Muslim although my father opposes our marriage?

A: If the matter is as you have described, you have to fulfill your promise and marry this woman even if your father opposes your marriage. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.