Pardon my cynicism, but I can't shake the feeling that Collins is in it for the money: the royalties, the many talk show and church and campus speaking engagements with their honoraria, and an almost inevitable award from the Templeton people.
You may have a point. I do wonder, though, whether mammon alone could induce a famous scientist to incinerate his own reputation. The seductive power of simple-minded explanations is quite extraordinary.