Ruptured Rapture

I challenge Dispensational Christians to produce one single verse which unequivocally teaches a Pre-Tribulational Rapture. Just one verse. For Calvary Chapel this is a distinctive. Yet there's no actual Biblical evidence for this teaching. It took me about 3 months as a new Christian reading the Bible to realize this doctrine is false. How do people attend Calvary Chapels for 30 years and not realize it? Is it all about wishful thinking? How can Calvary hold to such a shaky distinctive?