Your ex-relative exemplifies the fault of modern Christians that aren't satisfied with living out their faith and must force it on everyone. When they made it political, in spite of the Constitutional mandate for our government to remain secular, and thought it was their duty as Christians to forcibly convert us all they stepped into the category of an enemy of our country.
I say that as someone who made my choice to attempt to make Christ's teachings the foundation of my belief system and the go to reference for important decisions. I don't have to believe everything claimed by the religious zeolots to see the value in such a life path. I only have to acknowledge that the one "truth" in life is that what I believe has no bearing on reality beyond its impact on how I react to my environment and the fellow beings that co-habitate it with me.