"Why do born-again people so often make you wish they'd never been born the first time?"

This quote by Katherine Whitehorn is a humorous method of expressing the concept that some people who have been born again, or have had a religious conversion, can be extremely zealous in their newfound faith. They might be so passionate about their beliefs that they become overly preachy and pushy, attempting to transform others to their mindset. This can be off-putting and make people want they had never experienced the born-again person in the very first location. Whitehorn's quote is an amusing way of revealing the concept that some born-again individuals can be too pushy and self-important in their newly found faith.