Debunking Dan McClellan's Christian Relativism

Dan McClellan made a video following the September shooting of Latter-day Saints in Michigan, with a couple interesting claims. Nate Williams sympathizes with him over the horrific tragedy, while correcting his misguided notion of "Christian Relativism." Yes, we can define what it means to be a Christian.

Sources:

https://www.youtube.com/watch?v=twE8EliXfq4
https://abcnews.go.com/US/michigan-lds-temple-mass-shooting-victims/story?id=126036535