I totally disagree that it's wrong/sinful to "delay" marriage. This should come as no surprise.
When you find "The One" and you decide that you want to get married and build a life together, that's when you get married. If you haven't found that person, don't get married to some random person for the sake of being married. Better to be single for a little while longer than to be in an unhappy marriage or go through a divorce.
Now, if you've found "The One" and you're trying to avoid the topic of marriage just because you're not ready to trade in your sportscar for a minivan, that's a problem.
I also disagree with the concept of the man as head of household and the woman as the obedient wife. Both partners in a marriage should share the responsibilities of head of household. But that's another topic.