He is not God of the dead but of the living. You are greatly misled.
What I've said is Biblical truth, but real truth is very much different from the tradition you believe. You have so much error-filled tradition packed into you, probably from denominational churches, it's almost impossible for you to discern the truth about anything.
Those that will be of the living are said to be asleep. Although that's a figure of speech, when you are awakened, it will be exactly as though you were asleep.
John was said to have been written late, maybe 15-20 years after the end of Acts. There is no scripture that changes this. It still holds true.
Jn 3:13
And no man hath
ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.
Sure messes up traditional beliefs, doesn't it. Every day, you read about a person that's died and their loved ones always say that the person that died is in a better place, meaning heaven. That's a 100% total lie that is perpetuated by the terrible denominational church system. Of course, that lie brings in a few more bucks. Every little consoling white lie helps, moneywise. A Little here, a little there. The really sad part is that many of those preachers are so bad, they believe that nonsense, themselves.