If it's not fear that is required, it's usually stupidity or gulliblity that reigns
Consider the Tuka Movement in Fiji in 1885 or the Taro Cult in northern Papua New Guinea in 1919. These were "cargo" cults. The native people built planes, control towers and runways out of straw and sticks. They even made fake headsets and flares. There is still one such cult, in Tanna, Vanuatu. They worship John Frum, and believe that he will return one day, to kick all the white people out of their lands and bring them all the "cargo", manufactured clothes and supplies and canned foods, they will ever need. They specifically believe their dead ancestors built the planes, filled them with goods, and the planes were lured off route by sneaky white men.
Knowing where the cargo actually comes from, knowing John Frum never existed (he was a fictional character made up by a native named Manehivi) and knowing that straw planes and control towers will not produce cargo from the skies, would you believe in John Frum?
Don't be so quick to say no. What if I told you John Frum was just another way to say nature? John Frum is real, he talks to me? Guides me? Just because the story behind John Frum was a misunderstanding on the behalf of the native people, not realizing that World War II planes were dropping this cargo and using the island as a jump spot, why should I renounce the existence of John Frum?
No, John Frum is very real. He is real in the hearts of the natives. John Frum is every bit as real as any other deity, which says quite a bit. If we were to explain the origins of the cargo, show them how it was produced, where it came from and how it got there, I'm sure there would still be natives that insisted, "That doesn't mean John Frum isn't real..."
Replace "JOHN FRUM" with whatever you call your deity. This is how the non-religious view the religious, in the wake of knowledge and scientific advancement.