Antichrist in Poul and Karen Anderson's historical tetralogy and compared that tetralogy to James Blish's theological trilogy. For completeness, we should also mention the Antichrist in the trilogy which is thematic, not linear, and need not be read in numerical order.
In Volume III, the main protagonist imminently expects the Antichrist.
In Volume I, Roger Bacon sees the Antichrist - in a drug-induced vision.
In Volume IIa, Armageddon happens without the Antichrist. When the black magician complains that this breaks the Law, a major demon retorts:
"WE WILL DO WITHOUT THE ANTICHRIST. HE WAS NEVER NECESSARY. MEN HAVE ALWAYS LED THEMSELVES UNTO ME."
-ASK (London, 1991), p. 423.
In Volume IIb, the white magician thinks that a newly elected demon Pope is the Antichrist whereas instead he is the Vicar of the new God.
Some Christians have put the Antichrist into novels but have failed to make their good side remotely appealing.