As a Christian, this is my understanding:
Jesus Christ returns to Earth from Heaven
1 Thessalonians 4:16 New International Version (NIV)
For the Lord himself will come down from heaven, with a loud command, with the voice of the archangel and with the trumpet call of God, and the dead in Christ will rise first.
1 Corinthians 15:52 New International Version (NIV)
in a flash, in the twinkling of an eye,
at the last trumpet. For the trumpet will sound, the dead will be raised imperishable, and we will be changed.
The Bible specifies the order of the Lord Jesus Christ coming.
There are 7 angels with the trumpets and for each sound of the trumpet is an event that we will see on earth
Revelation 8:2-13; 9 - If these happens on our life time.
These events as it happens, when the angels sound their trumpets are catastrophic as the Bible describes.
First trumpet : a third of the trees were burned up, and all the green grass was burned up
Second trumpet: a third of the living creatures in the sea died, and a third of the ships were destroyed
Third trumpet: a third of the waters turned bitter, and many people died from the waters that had become bitter
Fourth trumpet: a third of the day was without light, and also a third of the night
Fifth trumpet: pestilence like plague inflicting suffering on the damned for 5 months, Satan is imprisoned
Sixth trumpet: 1/3 of mankind killed in a war
The last trumpet: the Lord Jesus Christ returns, the people who will enjoy the first resurrection and those alive in Christ, will join him for a thousand years in the Holy City
After a thousand years, Satan is released and then prepares a huge army.
The Holy City returns and surrounded by Satan and his army.
Fire from heaven engulfs them and they are routed.
Satan is defeated and thrown to the lake of fire [second death].
The earth and the sky will disappear
The rest of the dead will be resurrected [second resurrection]
The books are opened and each are judged accordingly
Death and the false prophet will be thrown in the lake of fire
and the people whose names are not found in the book of life.
They will be there forever and ever.
Meanwhile...
There will be a new heaven and a new earth for the chosen to enjoy.
Everything in the past will not be remembered.
God would answer the prayers of his chosen even before they asked it.
Everything is made new.