Wow, this is a difficult one. The simple truth is that your father may never accept. It really depends on how closed minded he is. The best path to take, in my opinion though, is to be understanding from his stand point and avoid arguments on the subject. If it is brought up have calm knowledgeable answers. For instance, if the question is ‘what are you going to do about your children? what faith would they be?’ Have a calm and intelligible answer like, ‘we plan on educating our children on both religions and when they are old enough, they will decide what they believe.’ but stay CALM. Arguments will just ‘close his door’ to communication. Above all else, PRAY, PRAY, PRAY!!! Good luck and Blessings!