In “Apocalyptic Tremors, Study the Revelation Like Never Before” (2012, ISBN 9781449719609), the author — Carolyn Ruth Chapman M.A. — tells us that the Apocalypse is “a revelation of the justice and judgments of God, the need for justice calls Christ to be judge of all people” and “the completion of every Old Testament prophecy and promise to the people of God.” At the same time, for us (Christians), it’d a time of rejoice as he would meet our maker.
“God’s justice brings hope, but war and demonic struggles bring horror. Focusing upon the justice of God is more important than understanding symbolism and war intrigues.”
The author emphasizes on faith (believing, trusting God) during the time of Tribulation (sorting believers from non-believers) as explained in her quote below…
“(2 Corinthians 1:8) In such tribulation, Paul learned to trust God to deliver Him by giving him strength to overcome, not by means of escape.”
… based on 2 Corinthians 1:8 (quoted below).
“For we would not, brethren, have you ignorant of our trouble which came to us in Asia, that we were pressed out of measure, above strength, insomuch that we despaired even of life.”
— 2 Corinthians 1:8 KJV
As much as this time would be of rejoice and overcoming temptation, it’d also be a time of punishment to non-believers.
In my opinion, I think the term “non-believer“ might not only refer to anyone who doesn’t believe in God, but rather anyone that could be categorized as evil (not only those who break the Ten Commandments) like thieves and killers.
The author also makes a relation between the three Abrahamic faiths (Judaism, Christianity & Islam) and the text and symbolism of the Book of Revelation.
It’s an interesting study.