Welcome. I live a somewhat mirrored life to yours. I recently resigned as an elder and my wife is more mentally "in" than I am. A few years ago, when I first started to voice my doubts, my wife was scared. She put up the walls common to those who have been immersed in high control groups. Granted, my approach was flawed as I was fueled by feelings of confusion and despair. I backed off, learned to balance my emotions a bit (posting here has been therapeutic), worked some internal issues out and focused on being the best husband I can be. Presently, she is slowly awakening and has grown comfortable with having her own ideas independent of the WT Org. It turns out that she has always "made the 'truth' her own." I, on the other hand, was the more imbalanced one in terms of how I perceived JW doctrine. I had a hard time letting go. We also are learning that when it comes to spirituality, no two people can be on the exact same page at the same time. It truly is an individual journey. In coming to terms with this, our relationship has gone from good to great. We have learned that religion doesn't necessarily make a happy marriage. Respect, patience, and love make a happy marriage.
You mentioned "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." Maybe. May I ask though, how many other religions have you closely associated with? Have you spent enough time getting to know people of other religions so as to have enough evidence to say that only JWs experience high levels of love and harmony? And where does the JW unity come from? Do all JWs really believe the same, or, is unity more a reflection of Organizational control?
From my experience, I have found love and harmony in abundance outside of the WT Org. Other religions share the same type of love among members. I have also found love and goodness among the non-religious. As a JW, I have been told that we have something that no one else has. The Org goes to great lengths to tear down other people's belief systems and build up their own. If you pay attention, you may notice a lot of "us vs. them" language. JWs talk about how people of "the world" can't be as happy as them. They paint a picture of "worldly" people being miserable and lost. On the other hand, they build up JWs as the happiest people who have real hope and real "truth." It's "JWs vs. everyone who isn't a JW." I don't find that approach to be very Christian, let alone beneficial to humanity in general. Once I dropped the attitude that I was somehow superior and special just because I was part of a certain religious group, I began to notice that many people outside of the JWs are really happy. They do live good lives. They do have hope. We can learn so much from everyone but only if we drop the idea that we're the only ones with "truth." This is not to say that there aren't good aspects to being a JW. I'm only saying if love and harmony are evidence of God's hand, then I see God's hand working everywhere, not just in the WT Org.
