We just can go on and on like this. I told you what I believe and ultimately is God through Jesus who will judge anyone according to their standing.
The Jewish people were waiting fo Messiah but when Jesus came they did not believe that he was the one. He proclaimed the message of the kingdom that was about to come but they rejected that message. You know what happened to them.
Let's say hypothetically that Jesus returned as king in heaven and He moved some honest people and commissioned them to announce the newly established kingdom. What will happen to those of christianity who do not believe and reject Jesus's second coming. Are they not in the same position as the Jewish nation who by the way they still waiting for Messiah?
"I tell you that He will bring about justice for them quickly. However, when the Son of Man comes, will He find faith on the earth?” Luke 18:8
For the Lord will rise up as at Mount Perazim, He will be stirred up as in the Valley of Gibeon, To do His task, His unusual task, And to work His work, His extraordinary work. And now do not carry on as scoffers, Or your shackles will be made stronger; For I have heard from the Lord God of armies Of decisive destruction on all the earth. Listen and hear my voice, Pay attention and hear my words. Does the farmer plow continually to plant seed? Does he continually turn and break up his ground?" Isaiah 28:21-24
"Who hath believed our report? and to whom is the arm of the LORD revealed?" Isaiah 53:1
And because iniquity shall abound, the love of many shall wax cold. But he that shall endure unto the end, the same shall be saved. And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.
I don't see there will be another gospel preached from now on. We are at the moment in time when people moving away from everything is God.
As for Jehovah's witnesses literature I only read anything until 1949. Although there is some truth in it after that, I believe they started falling away from the truth as the bible predicted and ultimately they have become the evil servant they are today.
"It was also given to him to make war with the saints and to overcome them, and authority was given to him over every tribe, people, language, and nation. All who live on the earth will worship him, everyone whose name has not been written since the foundation of the world in the book of life of the Lamb who has been slaughtered. If anyone is destined for captivity, to captivity he goes; if anyone kills with the sword, with the sword he must be killed. Here is the perseverance and the faith of the saints."
Revelation 13:7-8, 10