Yes the lights in the sky are to signify Time, days and years, on Earth, not to signify any return of Christ.Gen 1:14 And God said, "Let there be lights in the vault of the sky to separate the day from the night, and let them serve as signs to mark sacred times, and days and years.
People on Earth use those lights to keep track of time and events like seasons which continue to repeat themselves. From those repetitive cycles we learn that there are physical cycles and that which was shall be again and there is no new thing under the sun.
The same principle applies in spiritual cycles.
1 John 2:18-19 Dear children, this is the last hour; and as you have heard that the antichrist is coming, even now many antichrists have come. This is how we know it is the last hour. 19They went out from us, but they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us.
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.
1 John 4:3 but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world.
Rev 19:20 But the beast was captured, and with it the false prophet who had performed the signs on its behalf. With these signs he had deluded those who had received the mark of the beast and worshiped its image. The two of them were thrown alive into the fiery lake of burning sulfur.
You misquoted 1 John 4:3 above.
KJV.. 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.
Now I ask you, do you believe that Jesus Christ IS COME in the flesh on Earth today and is HERE RIGHT NOW in the flesh? OR are you one of the people who believe he WAS once on Earth in the flesh, IS NOT on Earth in the flesh today but one day in the unknown future will arrive on Earth in the flesh again?
If you believe he is here on Earth in the flesh today, why are you waiting for him to arrive in the flesh at some future time?
If you do not believe he IS COME on Earth in the flesh today, you are of antichrist according to 1 John 4:3
Christ is the SAME yesterday Today and forever. Heb 13:8
He was on Earth in the flesh "yesterday", IS still on Earth in the flesh today the SAME as he was in the past and will be on Earth in the flesh tomorrow and all future tomorrows the SAME as he IS today.
I sincerely hope that one day your eyes will be opened and you will see and know that Truth.