It was a myth, it kept people under control so the Roman’s adopted it.
Does it? What system do you think is easier for controlling a vast polytheistic and multi-ethnic empire? "Hey, worship your ancestral gods as much as you want so long as you also worship the emperor" or "accept Jesus Christ as your one lord and savior and disavow your fake idols"?
Only a fucking mongoloid would think the latter would be preferable from the perspective of a government with enough shit on its plate as it was. Hence why the Romans cracked down so hard on Christianity, they knew a religion like that spreading would be bad for business.
Odd how Josephus”s story was never corroborated and he never converted. He knew the whole movement was childish and silly.
If Josephus was a tool of the Romans and the Romans wanted to spread Christianity to control people, wouldn't make more sense for him to wholeheartedly endorse it rather than off-handedly mentioning Jesus in a twenty volume treatise on Jewish history?
Your childish, simplistic conspiracy theory isn't even internally consistent. You've pivoted between three mutually contradictory explanations already.