This is a bottle that had been used in a Catholic church. The symbols in the second photo at the bottom of the vase represent the Alpha & Omega. The two letters that look like P and X in the English alphabet are actually chi (looks like X) and rho (looks like P) from the Greek alphabet. They also happen to be the first two letters of "Christ" in Greek (Christos). Hence the chi-rho monogram is used as a symbol of Christ, Christianity, and Christians.
WOW that is a rare find! And intact too. What a score! I searched high and low and found nothing similar online. THis will continue to be a mystery but I agree that it has religious significance. What I do not know as of now.