As today, my dad said to me: "Whos going to support you the day you turn 18? Cause Im not."
How nice of him to warn you that as soon as you turn 18, he's going to, like the programmed robot he is only interested in salvaging his position within the congregation, that he's going to turn off his feelings for you as easily as he can turn off a light switch.
Like I\P said, ask him if that's the answer he's going to expect from you when he's 98, old a feeble, and all his WT cronies are long dead or dying and the corporation he has so much love for has no more user for him? Ask him, in front of your mother, if that's something he want you to tell her in 10 years, if,god forbid, something happens to him and you're the only one around who would care for her?
Only then, will he realize how selfish and stinging the words he's spoken to you were.