Actually, there are two famous people with the name William (Bill) J. Murray. One is chairman of the Religious Freedom Coalition (http://www.rfcnet.org) and the other is an actor.
Bill Murray the actor has a sister who is a nun, and he was raised Catholic. As for his beliefs as an adult though, he has chosen to remain silent.
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No, they are brothers. Bryan is Bill's older brother
No.
Harold Ramis stated that Bill Murray was bitten twice during the filming.
Bill Murray voiced Garfield .
No