Æthelberht died on 24 February 616 and was succeeded by his son, Eadbald, who was not a Christian—Bede says he had been converted but went back to his pagan faith, although he ultimately did become a Christian king.
Eadbald outraged the church by marrying his stepmother, which was contrary to Church law, and by refusing to accept baptism.
Sæberht of the East Saxons also died at approximately this time, and he was succeeded by his three sons, none of whom were Christian.
A subsequent revolt against Christianity and the expulsion of the missionaries from Kent may have been a reaction to Kentish overlordship after Æthelberht's death as much as a pagan opposition to Christianity.

In addition to Eadbald, it is possible that Æthelberht had another son, Æthelwald.
The evidence for this is a papal letter to Justus, archbishop of Canterbury from 619 to 625, that refers to a king named Aduluald, who is apparently different from Audubald, which refers to Eadbald.
There is no agreement among modern scholars on how to interpret this: "Aduluald" might be intended as a representation of "Æthelwald", and hence an indication of another king, perhaps a sub-king of west Kent; or it may be merely a scribal error which should be read as referring to Eadbald.
Æthelberht died on 24 February 616 and was succeeded by his son, Eadbald, who was not a Christian—Bede says he had been converted but went back to his pagan faith, although he ultimately did become a Christian king. Eadbald outraged the church by marrying his stepmother, which was contrary to Church law, and by refusing to accept baptism. Sæberht of the East Saxons also died at approximately this time, and he was succeeded by his three sons, none of whom were Christian. A subsequent revolt against Christianity and the expulsion of the missionaries from Kent may have been a reaction to Kentish overlordship after Æthelberht's death as much as a pagan opposition to Christianity.
In addition to Eadbald, it is possible that Æthelberht had another son, Æthelwald. The evidence for this is a papal letter to Justus, archbishop of Canterbury from 619 to 625, that refers to a king named Aduluald, who is apparently different from Audubald, which refers to Eadbald. There is no agreement among modern scholars on how to interpret this: "Aduluald" might be intended as a representation of "Æthelwald", and hence an indication of another king, perhaps a sub-king of west Kent; or it may be merely a scribal error which should be read as referring to Eadbald.
Æthelberht of Kent