This writer is clearly an enthusiast who gets messages from God, and is especially enthusiastic for the "eternal life" idea as found in John 3:
'... in the New Testament, eternal life is THE dominant concept and central to the “earthly” ministry and divinity of Jesus Christ'.
In John, eternal life is a matter of belief in Jesus (John 3:15f.).
In the Synoptics, however, about which the writer says nothing, eternal life is a matter of keeping the commandments, divestiture of possessions with distribution to the poor, and following Jesus (Matthew 19:16ff; Mark 10:17ff; Luke 18:18ff; also Luke 10:25ff. where showing mercy to a mugged foreigner is showcased. Luke is, after all, a gospel in transition from Jewish gospel to universal gospel).
Obviously the Synoptic teaching presupposes discipleship in the eschatological setting of the historical Jesus with all its urgency, which by the time of John has all but disappeared. It attracted few, because it was so hard.
The way of belief was easier, and came to attract many.
Which version is "central to the 'earthly' ministry"?
I think that's obvious, but not to an enthusiast.
