Christians should always be ready to present the reason for the hope that we have in Christ. However, this is completely different than attempting to win people with arguments and words. What we often fail to remember is that the Holy Spirit is deeply involved in the process of saving souls. We need to rely less on ourselves, and more on Him. Either He opens eyes, or He does not.
Debate often does nothing, except create pride and a false sense of being right, when the "winner" of the debate might be bathed in error. Presenting the Truth in love is what we - as authentic Christians - are commanded to do. Debating does not usher people into the Kingdom of God. The Holy Spirit does that. Our job is to tell them the truth, whether they listen or not.