If you're looking at churches or denominations, you can visit them or go on wikipedia and see what it says. Often wikipedia or church websites will say stuff like, "numbering 72 million, these individuals subscribe to the doctrine that..."

Imagine, though, if you looked and the entry said, "these individuals are known by their love for one another." (John 13:35)

Imagine going to a congregation and having the takeaway that, "These people love one another! They love God!" Imagine if it came across as a caring family, and not just some religious organization or awesome band playing. That's Christ's vision, so let's make it ours!