How many times is the Antichrist mentioned?

Answer 1

4 times. Three times in the book of 1st John at 1 John 2:18, 1 John 2:22, and 1 John 4:3. Once at 2 John verse 7. Interestingly though, at least once John referrs to the antichrist in plural form, meaning that there are more than one who are called the antichrist, and he indicated that the influece of the antichrist was already at work in his day, some 2000 years ago. The antichrist is not one person, but a collective group that make up those who deny the Christ, and was already active way back in the Apostle John's day.