I've been hearing encouraging reports of what God is doing in the world today. Loren Cunningham shared a few stories this weekend of reaching unknown people groups, miraculous healings and huge faith gains. These made me want to get involved and do my part. What is my role in bringing people to God? Do I just need to say and do the right things? Is there a manual to follow? The truth is God doesn't need me to bring people to him, but to not turn them away. Even Jesus gives God the credit for bringing people to him, "All those the Father gives me will come to me, and whoever comes to me I will never drive away" (John 5:37). So if even Jesus doesn't call people to himself, it is impossible for us to do that with words or deeds. But, it is also possible to drive people away. Matthew 23:13 has a woe to teachers (Pharisees) saying, "You shut the door of the kingdom of heaven in people's faces. You yourselves do not enter, nor will you let those enter who are trying to."
So, I don't have to be preoccupied with saying or doing the right things to call people to God, because he does that himself. I do however, have to keep my heart humbly connected to the Lord's so that I don't turn people away. I guess that is why God says in Revelations 3:16 that he would rather you be hot or cold, not lukewarm. If you're hot for the Lord, you will be correctly representing him and if you are cold you won't be claiming to be serving him. But, if you claim to be a Christian but don't life like it (lukewarm), that is when you can do some damage to his reputation. 
From this I've learned that God is all powerful and doesn't need me to call people to him, and that I can do damage. So, should I just get out of the way? No, it is a privilege to be a part of his work. I get to experience blessings as a result of involvement, obedience to my calling and it shows the fruit of my truly changed heart.