Col.2:2...all riches of the full assurance of understanding, to the acknowledgement of the mystery of God, and of the Father, and of Christ; 3 In whom are hid all the treasures of wisdom and knowledge. 4 And this I say, lest any man should beguile you with enticing words.

Incorporate into your preaching that the God of scripture must be assumed to exist in order to have objective morality. Otherwise it is purely arbitrary; that is Determined by chance, whim, or impulse, and not by necessity, reason, or principle. Sorry for the low sound and not being visible. You can watch our video on moral laws: • Moral Laws

Once you feel comfortable with your presuppositional apologetics you can incorporate it into your preaching and evangelism by casting down the philosophies of men and doctrines of devils. We are to bring every thought into captivity to the obedience of Christ by overthrowing these philosophical strongholds. 2 Cor.10:3 For though we walk in the flesh, we do not war after the flesh: 4 (For the weapons of our warfare are not carnal, but mighty through God to the pulling down of strong holds;) 5 Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ;