“Defending the faith” is a futile exercise, as the battle is fought with those who are convinced to be your enemy. The better route is to “embody the faith” as it is the surest “weapon” against the unbeliever’s heart, and thus towards winning their mind.

I am thankful I learned this lesson a very long time ago, when I used to battle atheists on religious forums, resulting in much energy and time redeemed for other purposes.

Also, Romans 12:17-21.