"Therefore say unto the house of Israel, thus saith the Lord GOD; I do not this for your sakes, O house of Israel, but for mine holy name's sake, which ye have profaned among the heathen, whither ye went." Ez. 36:12 KJB
God was trying to clean up his own name because of what the Israelites had done. As they went around and had done wickedly they were not only making themselves look bad, they were also making God look bad among the heathen. When we do wrong and then tell people we are Christians it makes God look bad. We have his reputation to uphold.
There was an article written in the Wall St. Journal that quotes the CEO of Google as saying, "Mr. Schmidt is surely right, though, that the questions go far beyond Google. "I don't believe society understands what happens when everything is available, knowable and recorded by everyone all the time," he says. He predicts, apparently seriously, that every young person one day will be entitled automatically to change his or her name on reaching adulthood in order to disown youthful hijinks stored on their friends' social media sites."
The world does not even put a value on your family name, much less on what we are doing to God's name when we act inappropriately as Christians.
How can we lead others to Christ if we are living a life full of sinful choices? People need the Lord. Does your life, does my life, reflect who God really is?