>> “During the last part of the Tribulation, the only people who suffer are the ones who took the Mark of the Beast.” <<
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No, they will suffer after the trib. They are among those against whom Yeshua will make war on his return to Earth.
Only Yehova’s elect will suffer in the trib. It is Satan that does the tribulating.
During that seven year period, even before Jesus comes back for the final battle, my Bible reads that up to 2/3rds of the people of the world get wiped out. Yes, the beast system makes war against the saints...but we also know that for 3.5 years the two witnesses make it very uncomfortable for the Beast and the world’s evil population....so much so that there are mass celebrations all over the world when the Beast is allowed to kill them...and at least for 3 days they stay dead. I have always wondered that when the two witnesses are raised up, God raptures his suffering church with them to escape that last 3.5 years when God really starts pouring down his wrath.
I know the rapture is coming at some point and lots of scriptures can be cited as to when how and so on....probably pre-trib but after the world beast system is in operation though That son of perdition may not have quite taken public power as of yet or he is known for just a short time yet the 7 year pact with Israel had yet to be formulated.(All depends on how one reads Thessalonians as to how one understands the scenario.)