There are some tremendous differences between Christian morality and do-it-yourself morals. For example, having sex outside marriage. Many feel that is perfectly fine, it hurts no one. However, if all people followed true Christian morals, every person would go into marriage a virgin, and your spouse would be the only person in the world that would represent complete intimacy. Talk about a bond!! No STDs, ever. AIDs would disappear.
A second good example is abortion. Many feel that is perfectly fine, it hurts no one. However, God's word makes it very clear that a child is a child not only before birth, but also before conception, so abortion truly is murder. If all people lived by true Christian morals, every child would be born within a family headed by his or her biological father and mother (unless there was a terrible tragedy), and would be regarded as a blessing straight from God.
Christians are not perfect people, and can't live up to God's moral code. But, the if the entire world tried to live up to that code, how much better would be the lives of all!!