Revelation 2-3 talks about the Christian church but Revelation 5:9-10 shows Christians up in heaven.
Then Revelation 6:1, all the way to the end, never mentions about the church.
Then, in Revelation 7:4, it talks about the Jews, and Revelation 7:9 talks about Gentiles nations going through, verse 14, the tribulation.
So, that means that the church is not in the tribulation but Jews and Gentiles are.
Some might say, well, those Jews and Gentiles are Christians.
No. In Galatians 3:28, the Christian church cannot be called Jew or Gentile.
1 Corinthians 10:32 points out that the Jews and Gentiles, and the church are separate categories.
They’re all not the same, that’s why Revelation talks about the saints in reference to Jews and Gentiles, but it never says church at all anywhere in the tribulation.