Jesus says in the Bible;
Then he said to his disciples, “The harvest is plentiful but the workers are few. Ask the Lord of the harvest, therefore, to send out workers into his harvest field.” (Matthew 9:37-38, niv)
Jesus looked at the crowds following him and referred to them as a field ripe for harvest.
There may be many people who are ready to give their lives to Christ if someone would show them how.
Many Christians believe they have a personal responsibility to pass on the gospel.
Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, and teaching them to obey everything I have commanded you. And surely I am with you always, to the very end of the age. (Matthew 28:19-20, niv)
Jesus commanded his followers to carry out evangelism.
Evangelism is world wide work.
Evangelism is for all Christians to be involved in at some level.