It has never meant to be against (anti). In the original language, in means "instead of" Christ.
Anything that replaces your relationship with Jesus Christ is that which is, "instead of" him. The things that replace Him in your life are usually very subtle and seemingly innocuous.
The antichrists in our life are never so completely obvious as to be readily apparent to us.
No horned beasts or fire-breathing dragons need apply.
John, the apostle, is the only one to mention the spirit of antichrist. And these are his conclusions about the antichrist spirit.
There are many antichrists.
Antichrists have been with us for 2,000 years.
Anyone or anything that denies the Father or the Son, is a liar and antichrist.
Any person that refuses to confess Jesus Christ came in the flesh is antichrist and therefore, not of God.
Antichrist is a spirit that can pervade anything.
To be antichrist is to be a deceiver by denying that Jesus Christ came in the flesh.
1 Jn 2:18, 22
Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time. ... Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son.
1 Jn 4:3
And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world.
2 Jn 1:7
For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.