We stopped at Saddleback Church in August and
listened to the Porpoise-Driven Prophet speak.
In an urgent letter posted on the Saddleback Church Web site on Wednesday, Warren says expenses are up because parishioners are out of work and "the bottom dropped out" when year-end donations dropped dramatically.
He asks parishioners to donate before the new year to keep the Orange County church out of debt, The Orange County Register reports.
A spokeswoman for Warren said the church does not release financial details, so it's difficult to put the $900,000 shortfall in context.
Warren delivered the invocation at the inauguration of President Barack Obama and is the author of numerous books, including the best-selling "The Purpose Driven Life."