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This doesn't sound like a good idea at all. Serving God for money isn't serving God at all. A "megachurch" begging for more money isn't doing God's will. Thing is, thru chance or satan, there will be some that do prosper during this 3 month period and credit the megachurch instead of God. The other side of that is that when those that don't increase are known, people will point at that church and slam our belief in God. I see nothing good coming from such a spectacle.
Texas Megapastor Issues Major Challenge to His Church Involving God, Cash — and a Whole Lot of Faith | TheBlaze.com
Making the decision to give, the church says, could lead to “unbelievable momentum” that invigorates’ its members lives. But if parishioners don’t see the benefits paying off after three months passes, they’re able to get their money back in full.