Case in point (a bit long; you can skip if you want
A missionary asserted (as part of a presentation to a Christian group, which ended with asking for a donation) that he felt obligated to go abroad in part because one day, a lady who he never knew and never talked to told him that he should go proselytize abroad.
The presenting missionary also related a story about another missionary whose family was ruined because they did not trust in God - this other missionary brought his family to Papua New Guinea to prosletyze, but was fearful of snakes. The other missionary then brought his family home to Louisiana in the United States, and lived in a trailer that was donated by his home church. One day, that missionary's children were playing around the trailer when one crawled underneath the trailer, ran into a nest of rattlesnakes and was bitten. The child screamed, and the missionary ran out of the trailer in response. He put the bitten child into his truck and quickly backed his truck out of the driveway. In his haste, he did not see another child behind his truck and ran that child over. At that instant, his wife ran out of the trailer and upon seeing two of her children severely injured, she collapsed and died of a heart attack. The presenting missionary said that this story motivated him to trust in God and go abroad, and that the missionary in the story suffered all of those ills because that missionary did not trust fully in God's protection (i.e. God will have protected them from snakes while in New Guinea had they trusted God). The group as a whole was "moved" as a result of his stories.
I spoke with someone who was also present, who is ambivalent about God and definitely not a Christian, and brought up the issue of whether the missionary was telling the truth about his stories.
I said that based on the missionary's body language, the fact that he was asking for donations to support his trip abroad, the hearsay nature of his stories, and the improbability of those occurrences which he asserted as causing him to believe in what he wants to do, his stories are not credible.
My fellow conversationalist (this is after we've left, and we were alone) responded with basically the following:
1. He believed the presenting missionary and the missionary's stories;
2. The missionary was doing good;
3. The missionary has absolutely no reason to lie;
4. I am a cheap bastard who didn't want to donate, and was looking only for a reason not to;
5. I (myself) am paranoid.
I said that he was changing the subject, since the original subject was about whether the missionary was telling the truth about his stories. My conversation partner repeated that I am paranoid and should trust other people more.