No one has yet sat in the "temple of God" and claimed that he was "God." Nor has he shown himself to be "God" by signs and wonders.
"And then shall many be offended, and shall betray one another, and shall hate one another." (Matthew 24:10). See also 2 Thess 2:3. The great falling away hasn't happened yet.
"For then shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be." (Matthew 24:21). This hasn't happened yet, and this precedes the "day of the Lord" (his return),
We are missing the events described in Rev 6:1-10 (Seals 1 thru 5) With the opening of the 6th seal this commences the "day of the Lord" which heralds Christ's return. It's been pretty quiet around here.
>> No one has yet sat in the “temple of God” and claimed that he was “God.” <<
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popes have been doing exactly that for about 1500 years.