For the Christian believer, this is the core of their apologetic. Nothing more is needed, except some study if you find a passage hard for you to understand. As a Christian, any defense of the faith (as required in 1 Peter 3:15 and Jude 3) does not require some kind of fake "neutral" ground. One example I've seen repeatedly is a demand to "not use the Bible", but how can we as Christians give up what is to be the rule and guide of our faith?
It is not our job to open the heart of the unbeliever, simply our duty to present the reason for the faith that is within us and contend earnestly. It is God's prerogative to bring conviction on them that they might be saved.