Is the great tribulation earthwide?

It will be. Jesus said, "For then there will be great distress, unequaled from the beginning of the world until now—and never to be equaled again." (Matthew 24:21)

Well nothing is happening here where I am so no it cannot be worldwide.

I think that is just that one Star Trek episode. That happened on a star base.

Yes.

it wont be where atheists and devil worshiper accept the mark of the beast

Only if you're a Tribulite.

That's what the book (Revelation) says. It's about future events that haven't taken place yet but will culminate in a 7 year period where God will judge mankind for its wickedness. By that time (or during that time, depending on how you interpret it) the Christians will be killed for not taking the market of the beast.

No, it is imaginary.

But as you are free to imagine whatever you want, you can imagine the tribulation to be all yours or worldwide or whatever.

Yes, here is a preview of what will happen...

The US, indeed, the entire world, is about to enter into its darkest period of human history ever and most people don’t even realize it. The coming time is darker than most are aware and they will get even darker when the 'Tribulation' period described in the bible starts.

Obadiah 1:15 “For the day of the Lord upon all the nations is near; As you have done, it shall be done to you; Your reprisal shall return upon your own head.

That time is a seven year 'Tribulation' period when the Anti-Christ rules the one-world government.

It starts with the Rapture (when Jesus takes His believers to heaven) and ends at the Second coming of Jesus Christ seven years later. Most of the wicked and many unbelievers will be judged during this time. However, many others will be saved and go to heaven, except now they will have to forfeit their life to be saved. The Bible says that the seven year tribulation period is so bad that men will faint in horror at the things coming upon the earth. World leaders will be confused and it won’t be until shortly after the seals are broken that the people on earth realize that the wrath of God has been poured out as promised by the Bible. The men on earth will try to escape but there will be no refuge. It will be so bad that men will seek that the stones fall on them in order to hide them from the one who sits on the throne in Heaven. This is a dramatic account of the tribulation period. The purpose of the tribulation period is to punish unrepentant sinners and to call Israel to redemption through Jesus Christ. Unfortunately, it will take over two-thirds of the world’s population to perish before the tribulation period will end. Yet when the tribulation period ends it will result in the redemption and regeneration of the Jewish people.