The short answer is that the Ekklesia (called church in most Bibles) is not the Kingdom.
The two differ in at least eight points.
If we take evangelism to mean giving the gospel message to someone who doesn't yet believe, it is certainly part of the mission of Ekklesia.
When we "make disciples", we are in fact converting a non-disciple into a disciple.
Since a disciple is at minimum one who believes the gospel and trusts Jesus, therefore, evangelism is part of our mission.
However, the mission extends beyond that.
It includes baptizing the new disciple as soon as possible.
Matthew 16:18 And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it.
The first principle is that each local group of believers is responsible for their own "backyard", their own "Jerusalem".
The second is that their lives and relationship with one another, and with the Triune God, form the background against which their listeners can and will evaluate their claims.
Making disciples means leading those who are not disciples into becoming disciples. Logically, the message needs to be preached "in the world" more than "in the church".
Colossians 4:17 And say to Archippus, Take heed to the ministry which thou hast received in the Lord, that thou fulfil it.
This verse says more than one thing of great relevance to today's "church", certainly of great relevance to the true ekklesia.
Who is this man Archippus?
For one thing, he lived in Colosse, and was a member of the ekklesia there.
For another, he had received a ministry in the Lord.
For a third, he was not fulfiling it.
The Ekklesia that Jesus founded is essentially spiritual in nature, and because it is spiritual, it is heavenly. If you can understand this it will answer a lot of the questions and settle a lot of issues that arise when we try to naturalize it, bring it down to the earth, and make it all about the “meeting” or the “building” or the “organization”.
Matthew 18:18 Verily I say unto you, Whatsoever ye shall bind on earth shall be bound in heaven: and whatsoever ye shall loose on earth shall be loosed in heaven.
19 Again I say unto you, That if two of you shall agree on earth as touching any thing that they shall ask, it shall be done for them of my Father which is in heaven.
20 For where two or three are gathered together in my name, there am I in the midst of them.