The Evangelist is a function of the Five-Fold ministry.

We find in Ephesians 4:11(NIV) that it reads, "So Christ himself gave the apostles, the prophets, the evangelists, the pastors, and teachers," this scripture reveals all of the functions of the five-fold ministry.

The idea is that when everyone is working together in their gifts and callings, the Ekklesia is able to accomplish more than what any one person could do on their own.

God's heart is for all people to be saved and to come to a knowledge of the truth. (1 Timothy 2:4 NIV). 

We find in Ephesians 4:12-16 (NIV) God's purpose for the five-fold ministry.

12 to equip his people for works of service, so that the body of Christ may be built up 

13 until we all reach unity in the faith and in the knowledge of the Son of God and become mature, attaining to the whole measure of the fullness of Christ.

14 Then we will no longer be infants, tossed back and forth by the waves, and blown here and there by every wind of teaching and by the cunning and craftiness of people in their deceitful scheming. 

15 Instead, speaking the truth in love, we will grow to become in every respect the mature body of him who is the head, that is, Christ. 

16 From him the whole body, joined and held together by every supporting ligament, grows and builds itself up in love, as each part does its work.