Gotquestions.org recently published two excellent articles that reiterate some essential basics for evangelism and sharing the Gospel of Jesus Christ.
First, biblical evangelism should proclaim the good news of the Gospel, the Holiness of God, and salvation through Christ alone:
“What is the biblical method of evangelism?”
When trying to decide how to share Christ with someone, the starting point should be the same as that of John the Baptist and Jesus Himself. Matthew 3:2 tells us that John began his ministry with the words “Repent, for the kingdom of heaven is near.” Repentance refers to a “change of mind,” which implies sorrow for past offences (2 Corinthians 7:10), a deep sense of the evil of sin as committed against God (Psalm 51:4), and a conscious decision to turn from sin to God. The first words Jesus spoke when He began His public ministry were identical to John’s (Matthew 4:17). (read more)
Next, we should be careful when engaging Jehovah’s Witnesses, Muslims, and other cult’s – particularly because of the cunning nature of their deception (and the fact that you’ll likely not change their minds):
“Should we allow false teachers into our home?”
The short letter of 2 John is written in part to warn believers against the influence of false teachers. John identifies them as those “who do not acknowledge Jesus Christ as coming in the flesh” and describes them as deceivers and antichrists (2 John 7). He goes on to prohibit receiving them into our homes or wishing them well. The question is whether this prohibition refers to those who knock on our doors today, such as Mormons and Jehovah’s Witnesses. Are we to deny members of these sects access to our homes?
[...] The Holy Spirit testifies to the true nature of Christ, while Satan and his demonic host deny that true nature. That is why John identifies anyone who denies the deity of Christ—which both the Mormons and Jehovah’s Witnesses do—as deceivers and antichrists.
What should be our response, then, when cultists come knocking at the door? John, writing by the inspiration of the Holy Spirit, gives a clear answer: we are not to receive them into our homes. (read more)
Of course, the Lord wills whom He will save – and who will accept the message of His Son and salvation through Him alone. We should not be afraid to approach others and engage in productive dialogue with non-believers. At the same time, we must understand that not everyone will embrace the message, so the Lord’s will be done.