Neither Dogma nor Life Of Brian are saying Jesus didn't exist. Dogma talks about being spiritual rather than a slave to one particular religion and Life Of Brian is just a joke about Brian who was said to be born on the same day and so was mistaken by many for Jesus. 'He's not the Messiah he's a very naughty boy'.
Personally, I lost my religion a while back but to say either are anti-the existence of Jesus is wrong.
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