Well, here's a tid-bit to get you thinking about some of the common slang slung about in religious-speak. It turns out that the etymology of the word "testimony" comes from the Latin word, testis, which means "witness". The same word, testis, provides the root for what we commonly call "testicles".
The original meaning of the word 'testis' referred to the credibility of a man due to his evident virility. Thus a man who had 12 children was more credible than a man who had, say, 3. So, if man with more children were called upon to present a case for something-or-another, he would testify. That is, he would speak out knowing that because his balls work well, people would believe him.
I suppose Christians have something else to consider now when they give their testimonies.