When I started driving a truck almost thirty years ago, the Wilkes-Barre area,
I-84/81 interchange was always a nightmare of construction traffic. I went
back through there a few years ago and it had not changed a bit.

I understand your Dad's mindset. When I was looking for relief from my GID, religion
found it's way into my life and thoroughly skarued my head for years. I'm sorry to
say that, from my experience, as long as your Dad is in this mindset, your best
course of action may be to let this "dog" (so to speak) fall asleep and leave it where
it lays. Let it wake up and seek your companionship on it's own.
There is no sense in bloodying yourself in a "battle" (This is the extreme Christian mindset)
that you will never be able to even find common ground in. Your Dad is fired up with a cause,
fueled with zeal to prove himself worthy of the salvation of Christ and will settle for
nothing less that your complete submission to the will of God, as he has been taught it.
Don't stop loving your Dad and there is no "shame" in admitting that you
still care for him. He does love you, this is obvious. He's searching
for answers as you are which, after all, is the essence of life.