This post (link) provides an excellent warm-up. If you have time, I encourage you to read it. It won't take long.
After you've read it, consider whether your evangelism technique mentions only love and heaven, or whether it also mentions wrath and hell ... but more importantly if it mentions, persecutions, trials, and difficulties.
Our spiritual ancestors, many of them, were martyred for their faith. Our brothers, in some lands, are being martyred and imprisoned even today. John the Baptist was imprisoned and eventually beheaded for preaching that someone's lifestyle was ungodly.
Guess what! Today, those whose lifestyles are even more depraved than those of the Herod family are trying to label John the Baptist-style preaching "hate speech," and trying to push for criminal sanctions. I doubt beheading is coming any time soon, but fines and imprisonment is definite possibility.
There can be real cost in terms of standing up for the truth of God's word - if you forget to mention this in your discussion with unbelievers, aren't really giving them a short 20?