Anyone who does not love does not know God, because God is love.
"God is love" gets printed on so many things — mugs, wall art, greeting cards — that it's easy to hear it as a soft, decorative phrase instead of an actual claim. But read the sentence whole: anyone who doesn't love doesn't know God. That's not decoration. That's a test. Love isn't just one of God's attributes among many here — it's presented as the way you can tell whether you actually know him at all.
That should make you suspicious of any version of religion that talks a lot about God but produces very little love in the people who claim to know him. This verse doesn't let belief and love be separated. If the second is consistently missing, the verse says the first probably is too, regardless of what someone claims.
You don't need theological training to apply that test. It's observable, both in others and in yourself. Whatever you eventually decide about God, this verse gives you a fair, checkable standard — not what people say they believe, but whether love actually shows up.
If you want a fair way to test any claim about God, this verse gives you one: look for love, not just words.
A short video on this is coming soon — for now, read on.