“Doubt is our product since it is the best means of competing with the ‘body of fact’ that exists in the mind of the public.” — a memo from a tobacco executive in 1969, outlining the smoking industry’s marketing strategy to suppress the then-growing body of evidence linking smoking to cancer.
They generated attack after attack to put in doubt what the studies increasingly found. If they didn’t sow doubt, they would lose clients.
Similarly, the devil’s main product is doubt. He will launch attack after attack against your faith. His goal? To keep his clients. To keep you out of prayer. To keep you discouraged. Don’t fall prey to him. Pray with faith.
* Adapted from Goldacre, Ben, Bad Science: Quacks, Hacks, and Big Pharma Flacks. Faber & Faber: New York, 2010. p. 109
Mustard Seed Budget 
Doubt also is the strategy the vitamin and nutritional supplement industry that keeps brisk sales despite studies showing lack of effectiveness. How do you think this relates to Christianity?