"In other words, the country is supposed to act as these people say, but not as large numbers of them do." While I do appreciate stats like these undermine our message, we should cower away from the fight because of that. Our message isn't "marry the opposite sex and your relationship will never fail" - it's that the male/female relationship is typically the best, and what God intended. And if the messuring stick is perfection - well, no human would ever be able to advise others or write laws regarding the desired traits of a society.
"...the difficulty of imposing their beliefs and values on others who do...." why is it secularists don't have this problem? Society will get someones' morals; the only question is whose?