What you just said sounds almost exactly what I went through 19 years ago when I told my JW mother that my husband and I were DA ourselves from the Watchtower. At that time she too said my marriage would not last because we no longer have Jehovah in our lives and that we turned our back on him. Still gives me the creeps when I repeat those words. The ironic part was our marriage actually got stronger, and we became happier after walking away from that cult. Even my own sons who were still very young tell me to this day that I became a much better mother after we left the JWs. We were finally free to be who we really are, and not the same old cookie-cutter new personality that the Watchtower was always shoving down our throats.
Nothing I said to my mother connected to her as far as why I was leaving, even the 1975 lie that the Watchtower had taught back then. 1975 was the reason my mother became a JW. They told her that she would be reunited with her daughter who died a couple of years before at the age of 5.
But on the positive note with my JW relatives totally shunning me, is that I don't have to deal with their toxic crap that they are always spewing out of their viperious mouths.