I notice that you have a tendency to just take a verse out of context when making your points. Verses 18 and 19 indicate that John was talking about persons who were Christians, or part of Christian groups, but departed Christianity, to deny Jesus as being the Son of God.So you believe any Jew who denies Jesus is the Christ is not antichrist?
Here is johns definition.
"whoever denies that Jesus is the Christ."
1 John 2:22
Who is the liar? It is whoever denies that Jesus is the Christ. Such a person is the antichrist—denying the Father and the Son.
So John was not describing Jews in general, who were unbelievers.
1John2:
18 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.
19 They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.