I suppose that we must also consider something else following http://www.askoldcoot.info/2012/03/20/are-we-solipsists because if we can create a god with our combined mental energy, could we also create our own heaven?
Is it possible that the devout Norsemen not only created Odin but also Valhalla? Are there immortal Vikings living out eternity in daily battles and over-night recovery? Are the faithful followers of Zeus now living an idyllic eternity in the fields of Elysium?
Do the religions of today have the devotion from their followers that could create an after-life according to their beliefs?
My belief is that there are not enough devoted people to do the solipsist magic. Our extended knowledge of the world and universe around us has denied us the absolute certainty that ancient civilisations seem to have been able to embrace.
Maybe Jesus came to Earth when he did because He knew that the developing sciences were going to be a threat to His own existence as the numbers who believed in him started to fall.
Maybe He came to earth to consolidate the existence that mankind had created for Him?
Maybe mankind brought Jesus to Earth in order to bolster the faith that they could see themselves losing?
There is ample evidence that the religions of today do not have devout followers in great numbers. The Christian religion is so segmented that it is possible there is not enough solipsist power in any segment to maintain a god and other religions, with the possible exception of Islam (even though it, too, is segmented), do not seem to be able to imbue their followers with great passion.
Has our sophistry and science damned us to non-existence by destroying our mental cohesion?