**I think it depends on your size…how you tolerate alcohol. 2 to 4 hours, to have a 2 or 3 beers seems ok. But, again, it’s not about being falling down drunk, it’s about alcohol impairing one …even just a little, to the point where the response time could be less.
But, if someone has 2 to 4 beers in the course of an afternoon…stopping at least one hour before getting on the road, it should be ok.
I would say that it could* be sinful, if one deliberately drinks, to the point of not being in the best shape to drive, and then driving…it shows no concern for others’ safety. To the degree of sinfulness, I don’t know…but I don’t imagine someone would be completely non culpable, who goes about making choices, without the concern of others’ safety. Just my two cents.*