Earlier quoted context omitted.
Credit cards are more like a delayed bill than debt, if you pay off the amount in full every month (and I don't know why you wouldn't, credit cards are a poor way to borrow money).
And yet, most credit card users do NOT pay off the amount in full. Why do you think banks push these cards so hard?
Although it has to be said a running balance is not actually a direct credit risk. It doesn't make financial sense, as you're racking up interest fees, but if you are safely managing your payments (no late ones) and your credit usage (a percentage of what your total available credit lines are) then it's not a bad thing for your credit score.
Not that I would recommend it of course.