Huon

John sends messages to seven (magic number) churches of Asia (Rev 1:4, and Rev 1:11), Ephesus, Smyrna, Pergamum, Thyatira, Sardis, Philadelphia and Laodicea. It is surprising that John never speaks of Antioch, Perga in Pamphylia, Iconium, Lystra and Derbe in Lycaonia, which were places where Paul preached. Inversely Paul never speaks of Smyrna, Pergamum, Sardis, Philadelphia and Laodicea.

The only places quoted simultaneously by John and Paul are Ephesus and Thyatira.

Paul makes one mention of Thyatira (Acts 16,12 to 16,15) :

16:12 and from thence to Philippi, which is a city of Macedonia, the first of the district, a Roman colony: and we were in this city tarrying certain days. 16:13 And on the sabbath day we went forth without the gate by a river side, where we supposed there was a place of prayer; and we sat down, and spake unto the women that were come together. 16:14A nd a certain woman named Lydia, a seller of purple of the city of Thyatira, one that worshipped God, heard us: whose heart the Lord opened to give heed unto the things which were spoken by Paul. 16:15 And when she was baptized, and her household, she besought us, saying, If ye have judged me to be faithful to the Lord, come into my house, and abide there. And she constrained us.

So, this Lydia of Thyatira worshipped God, but, either she had not been baptized, or a previous baptism was not valid in the eyes of Paul.

In his message to Thyatira, John says (Rev 2,20 to 2,22) :

2:20But I have this against thee, that thou sufferest the woman Jezebel, who calleth herself a prophetess; and she teacheth and seduceth my servants to commit fornication, and to eat things sacrificed to idols. 2:21And I gave her time that she should repent; and she willeth not to repent of her fornication.

It seems that Thyatira was a place where two sorts of Christians were in conflict, about baptism, and eating forbidden food (not speaking of fornication!).

About Ephesus, John writes (Rev 2,2 and 2,6) :

2:2 I know thy works, and thy toil and patience, and that thou canst not bear evil men, and didst try them that call themselves apostles, and they are not, and didst find them false;
2:6 But this thou hast, that thou hatest the works of the Nicolaitans, which I also hate.

About Ephesus, Paul writes (Acts 19,1 to 19,5) :
19:1 And it came to pass, that, while Apollos was at Corinth, Paul having passed through the upper country came to Ephesus, and found certain disciples: 19:2 and he said unto them, Did ye receive the Holy Spirit when ye believed? And they said unto him, Nay, we did not so much as hear whether the Holy Spirit was given. 19:3 And he said, Into what then were ye baptized? And they said, Into John's baptism. 19:4 And Paul said, John baptized with the baptism of repentance, saying unto the people that they should believe on him that should come after him, that is, on Jesus. 19:5 And when they heard this, they were baptized into the name of the Lord Jesus.

Still a problem with baptism.

Ephesus was a place where John, Paul, Apollos, the Nicolaitans were proselytising simultaneously. And that gave many sorts of christianism... It seems that at least one sort of "christianism" did not know "the baptism in the name of the Lord Jesus" !