Why is "crucifixion" pronounced "cruciFICTION"?

Many letters in English can take on more than one sound. "F" gets a 'V' sound in of. "O" gets an "I" sound in women. If you are trying to make a religious play with the word fiction, crucifixions were quite real and Jesus was crucified. The crucifixion is not in question, it's the rising from the dead that is.