Jesus said the Kingdom is already here, but very few would enter because they can't see it.
[ 10 Let your Kingdom come. Let your will take place, as in heaven, also on earth.]
There will be no giant rescue operation, called Armageddon or anything else, Jesus already did that with his sacrifice.
[ 7 But you who suffer tribulation will be given relief along with us at the revelation of the Lord Jesus from heaven with his powerful angels 8 in a flaming fire, as he brings vengeance on those who do not know God and those who do not obey the good news about our Lord Jesus. 9 These very ones will undergo the judicial punishment of everlasting destruction from before the Lord and from the glory of his strength, 10 at the time when he comes to be glorified in connection with his holy ones and to be regarded in that day with wonder among all those who exercised faith, because the witness we gave met with faith among you.
Christians don't believe in the Big Bang that began it all, but they do want a Big Bang to end it all. That's not what Jesus taught or demonstrated in his life.
[17 I saw also an angel standing in the sun, and he cried out with a loud voice and said to all the birds that fly in midheaven: “Come here, be gathered together to the great evening meal of God, 18 so that you may eat the flesh of kings and the flesh of military commanders and the flesh of strong men and the flesh of horses and of those seated on them, and the flesh of all, of freemen as well as of slaves and of small ones and great.”19 And I saw the wild beast and the kings of the earth and their armies gathered together to wage war against the one seated on the horse and against his army. 20 And the wild beast was caught, and along with it the false prophet that performed in front of it the signs with which he misled those who received the mark of the wild beast and those who worship its image. While still alive, they both were hurled into the fiery lake that burns with sulfur. 21 But the rest were killed off with the long sword that proceeded out of the mouth of the one seated on the horse. And all the birds were filled with their flesh.]