We’re talking here about people who are truly saved. Some who claim to be may not be, if their lives don’t reflect Christ. If they go about their same old ways, drinking, cussing, smoking, chasing women (lol), then you have to wonder if what they experienced is real.
Even "saved" people sin. And frankly, drinking is not a sin. "Cussing" is, but there are worse sins than that, unless we're talking about taking the name of the Lord in vain. "Smoking" is not a sin. "Chasing women" is fine, if a man is single.
Pride, gluttony, sloth, avarice, lust, wrath, envy are the seven deadly sins, because they lead to all the others, and pride is the worst.
I would believe there is more true fellowhip in a working man's bar on a Friday night than there is in a holier than thou service on Sunday morning. And less sin.