Compara traducciones versículo por versículo
et tout esprit qui ne confesse pas Jésus n'est pas de Dieu ; et cet esprit est celui de l'antéchrist, dont vous avez entendu dire qu'il vient, et maintenant il est déjà dans le monde.
Y todo espíritu que no confiesa que Jesucristo es venido en carne, no es de Dios: y éste es el espíritu del anticristo, del cual vosotros habéis oído que ha de venir, y que ahora ya está en el mundo.
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.
and every spirit who doesn’t confess that Jesus Christ has come in the flesh is not of God; and this is the spirit of the Antichrist, of whom you have heard that it comes. Now it is in the world already.