deceit,
Some great advice here! I won't add too much. Just a couple points...when talking with your dad, do not get emotional about it. Share a few points (the lack of love is a GREAT one!) but present it in a manner that shows how disappointed you are more than anything. Dis-illusioned may be a better word. But don't go into a gun-slinging match - you'll only shut the door all to quickly. But like someone else mentioned earlier- slowly, patiently, plant seeds of doubt. It will definitely take longer, but will work out in the long run for you. I'm speaking from experience - I approached my family full-forced with a combative attitude. All it did was close the doors even tighter than before. Don't do what I did.
You'll be in my prayers!
Billygoat