Some really thoughtful perspectives from Shelby and Terry. I can see that your challenge is rather different from mine, Gary, insofar as you can pursue a scriptural solution to greater effect than I can. My wife sees me as a non-believer, so whatever purely Christian logic I might apply will have a muted effect. Citing biblical references are still worthwhile in my case, but my wife will see secular proofs coming from me as more in line with my headspace. A few years ago, when I was not yet a defacto atheist (See Dawkins' scale of 1-7, 1 being a strong Theist who's belief in God is absolute and 7 being a strong Atheist who's non-belief in God is absolute. I'm a 6.) a purely scriptural approach would probably have worked for me. My fault for waiting this long.
Thanks for starting the thread. Horizons of possibility and understanding continue to expand.