Welcome!! Your first-ever contribution to this forum is wonderfully eloquent and quite moving.
I keep thinking that maybe God is backing the Witnesses because I see evidence of love and harmony that I have not seen in any other religion.
You're quite right about the undeniably positive aspects of the Witnesses culture. One point to consider is the extent to which you've had the experience to venture elsewhere for a first-hand look at other religious communities, on which you might base a comparison. Another is to consider the extent to which we were all intimidated into avoiding the experience of taking a first-hand look.
Were you to do so, you might be surprised at the extent to which you'll find such qualities in evidence. Since the congregations of most protestant religions are far more autonomous -- less hierarchical -- than their JW counterparts, you'll likely observe less uniformity over behavior. Still, it's been my experience that communties of caring, charitable, socially conscientious Christians do indeed exist and are far less rare than the WT stereotype would have us believe.