The New Testament never referred to multiple, distinct churches. It spoke of one Church, Christ’s Church.
As far as Wikipedia as your source: I recommend you move it up a notch in your research.
1 Thessalonians 2:14 For you, brothers and sisters, became ... For you, brothers and sisters, became imitators of God's churches in Judea, which are in Christ Jesus: You suffered from your own people the same things those ... //biblehub.com/1_thessalonians/2-14.htm - 20k
2 Thessalonians 1:4 Therefore, among God's churches we boast about ... Therefore, among God's churches we boast about your perseverance and faith in all the persecutions and trials you are enduring. ... //biblehub.com/2_thessalonians/1-4.htm - 19k
Galatians 1:22 I was personally unknown to the churches of Judea ... I was personally unknown to the churches of Judea that are in Christ. ... And still the Christians in the churches in Judea didn't know me personally. ... //biblehub.com/galatians/1-22.htm - 17k
Revelation 1:4 John, To the seven churches in the province of Asia ... John, To the seven churches in the province of Asia: Grace and peace to you from him who is, and who was, and who is to come, and from the seven spirits before ... //biblehub.com/revelation/1-4.htm - 19k
Galatians 1:2 and all the brothers and sisters with me, To the ... and all the brothers and sisters with me, To the churches in Galatia: .... ... //biblehub.com/galatians/1-2.htm - 17k
2 Corinthians 11:8 I robbed other churches by receiving support ... I robbed other churches by receiving support from them so as to serve you. ... I robbed other churches by accepting support from them in order to serve you. ... //biblehub.com/2_corinthians/11-8.htm - 18k
2 Corinthians 8:19 What is more, he was chosen by the churches to ... What is more, he was chosen by the churches to accompany us as we carry the offering, which we administer in order to honor the Lord himself and to show our ... //biblehub.com/2_corinthians/8-19.htm - 20k
2 Corinthians 11:28 Besides everything else, I face daily the ... Besides everything else, I face daily the pressure of my concern for all the churches. ... //biblehub.com/2_corinthians/11-28.htm - 18k
2 Corinthians 8:18 And we are sending along with him the brother ... And we are sending along with him the brother who is praised by all the churches for his service to the gospel. ... //biblehub.com/2_corinthians/8-18.htm - 18k
2 Corinthians 8:1 And now, brothers and sisters, we want you to ... And now, brothers and sisters, we want you to know about the grace that God has given the Macedonian churches. ... //biblehub.com/2_corinthians/8-1.htm - 18k
2 Corinthians 12:13 How were you inferior to the other churches ... How were you inferior to the other churches, except that I was never a burden to you? Forgive me this wrong! ... //biblehub.com/2_corinthians/12-13.htm - 19k
Revelation 1:11 which said: "Write on a scroll what you see and ... which said: "Write on a scroll what you see and send it to the seven churches: to Ephesus, Smyrna, Pergamum, Thyatira, Sardis, Philadelphia and Laodicea ... //biblehub.com/revelation/1-11.htm - 19k
Revelation 3:13 Whoever has ears, let them hear what the Spirit ... ..... Whoever has ears, let them hear what the Spirit says to the churches. ... //biblehub.com/revelation/3-13.htm - 17k
Revelation 3:22 Whoever has ears, let them hear what the Spirit ... Whoever has ears, let them hear what the Spirit says to the churches." ... ... //biblehub.com/revelation/3-22.htm - 17k
Revelation 2:7 Whoever has ears, let them hear what the Spirit ... Whoever has ears, let them hear what the Spirit says to the churches. ... He who has an ear, let him hear what the Spirit says to the churches. ... //biblehub.com/revelation/2-7.htm - 19k
I recommend you do a simple word search in the Bible before you criticize someone for their research.