A Dave Allen classic:
Fellow dies and wafts up to heaven. Met at the gates by Peter. “Welcome,” says the saintly gatekeeper, “I suppose you’d like a quick look around. So come along then…” Peter takes the newbie all though the beautiful gardens and through the delightful different areas of the hereafter. “Here are the Muslims, ” he says. “All welcome here, y’know. The Zoroastrians are over there, and the Buddhists alongside..” The newcomer listened politely but noticed they were passing a huge, solidly built brick wall about 50 ft high. “Er, excuse me, Peter”, he says. “But this wall, what’s that all about. Why have a wall?”
“Ah,” Peter replies, “We have to keep the Catholics behind there, away from all the others. They think they’re the only ones here!”