That claim has been debunked on this thread recently. We looked at some audits selected by a Topix Christian of church's willing to audit themselves and publish the results on the Internet, which you would expect to be the most honest and generous churches out there. We were unable to find even one church that spent more than 7% of its revenues on charity for the needy.The churches as we know them, are the most charitable and giving groups on the planet.
Perhaps you can debunk that debunking. Can you find us a few dozen examples of churches with 50% or better rates of spending on the poor? That should be easy if your claim is accurate.