Dr. Myers can't seem to find a definition of love that allows him to justify believing in it versus a god because he says it's too ephemeral. But I don't think that's true. We can measure it in the release of hormones and watch our minds react to it in MRI. We can see it in our behavior and in the behavior of those who love us. A dozen different people can look at a couple in love and agree, "yup. That's love."
In 1964, Justice Potter Stewart wrote,
I shall not today attempt further to define the kinds of material I understand to be embraced within that shorthand description ["hard-core pornography"], and perhaps I could never succeed in intelligibly doing so. But I know it when I see it, and the motion picture involved in this case is not that.
"I know it when I see it" isn't a good evidential standard, but it's the best one we have for abstract concepts. We know love when we see it. Would we know a god if we saw one? First show me a god, and then we'll talk about what we're looking at. That's the simple standard that believers fail whenever they attempt to conflate belief in their god and love.