The gospel is indeed thought to have been penned after the fall of Jerusalem. It's also not necessarily a prophecy to look at any grand building and say that one day it will be reduced to rubble. All structures come to this eventually.
As far as 'wanting to' doubt: it's not a matter of what one wants, but of what one finds convincing.
How convincing is the following message to our fundies?
One day this forum will no longer be on the web.
In that day you will know Odin is the true god.