Christians living exemplary lives in the midst of an unbelieving world is what motivates most people to accept Jesus. People who aren't Christians don't attend Sunday morning services; so unless we pattern our lives after Jesus and walk in His footsteps during the rest of the week, few will SEE any reason to alter their worldly lifestyles.
Waiting at the "church building" for sinners to come to their senses on Sunday morning certainly never worked in the past, want work today, and will not work in the future. There are several great programs now that take the gospel to the people in the streets, but I doubt these people will be comfortable attending "church" in many of our ostentatious buildings. Unless we plant a church in their community where they feel comfortable, our grandiose plans may just fail.
Until we are determined to sacrifice our personal lives (myself included) and walk with Jesus daily in the full presence of a watchful world--not as being perfect, but as loving God and our neighbors--I'm of the opinion the lost will remain lost.
"But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin." (1 John 1:7)You may be walking in the light just fine, that's great; but for the rest of us who stagger, stumble, and fall time after time, we are being watched by unbelievers who wonder if the Christian life is what it's cracked up to be. If you can't tell the Christians from the sinners, one just has to wonder!