Sunstone said:
Is fear of hell a sound basis for spiritual growth or a deterrent to it?
A "basis"? No. Living in fear of hell and forgetting about the repentance part can freeze one and prevent growth.
However, fear of hell can be a first step of spiritual growth.
And, as a practical matter, fear of hell prevents some people from doing harmful acts, so in that sense society benefits from the idea.
Can a person who is moved to adopt a religion out of fear of damnation to hell likely use that religion to become a more loving person?
I've seen it done.
Does a fear of hell do anything to promote a feeling or sense of connectedness to all things?
By itself? Probably not. But fear of hell is not usually found in a vacuum either.
In what way, if any, does a fear of hell promote spirituality?
It's the primary way my mother approaches spirituality. She'll be the first to tell you, "I need to have my toes stepped on." Her approach to spirituality, and life in general, is very "traditional" (in the Myers-Briggs sense).
But aside from NOT doing harmful acts, because of fear of hell, she also avoids them out of not wanting to disappoint God, and also out of love for Jesus.
Fear of hell is just one part of the picture.
(Obviously, the approach that works for my mother in no way works for me, but if it takes fear of hell to prevent people from stealing my lawnmower, you know, I'm really ok with that.
)