>>According to Revelation, John saw a "myriad of myriads," which is 10,000 x 10,000, or one billion.
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>

? TRANSFORM(10000 * 10000, "999,999,999,999")
>    100,000,000

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>My mistake ... 100 million, not a billion. Also, these were the angels around the throne, not the people. The people are numbered in an untold, uncountable way:
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>Revelation 7:9 - KJV - "9 After this I beheld, and, lo, a great multitude, which no man could number, of all nations, and kindreds, and people, and tongues, stood before the throne, and before the Lamb, clothed with white robes, and palms in their hands;"
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>The white robes were given them when they accepted Jesus Christ.

Although they were given white robes, this refers specifically to those that came out of the great tribulation (see verse 13 and 14). So not to be confused with the Christians that accepted Christ during the church age. (The church leaves the stage before the tribulation, Rev 4.1)