Tim Keller once stated,
“the reason people disbelieve in the gospel is not because it promises too little but because it promises too much. If you don’t understand that, you don’t even know what you’re rejecting. To reject the gospel with tears, to say, “I can’t believe in it,” with tears, that has integrity, and that shows you know what you’re rejecting. To reject it with laughter, to scoff at it, “People like that who believe things like that,” that shows ignorance.” Keller, T. J. (2013). The Timothy Keller Sermon Archive. New York City: Redeemer Presbyterian Church.
Sarah and Abraham both laughed at God when He promised them a child. They laughed because they could not understand.
If someone laughs at what your Christian beliefs and convictions do not be offended, pray for them.
Laughter is a sign of ignorance not a sign of true rejection.
So don’t reject those that laugh, teach them, show them, help them to understand.