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Justin and Hailey Bieber want their formal wedding celebration to be a religious affair because they feel bringing God into their marriage will make their union stronger ... this according to Stephen Baldwin.

Stephen was on his way to the New York State Fair -- where he's launching a new initiative for veterans called Ready Vets Go -- when he filled us in on the motives behind his daughter and the Biebs' formal wedding party.

Justin's father-in-law says the happy couple understands weddings and marriages are supposed to be a holy commitment, and they feel a religious ceremony will go a long way towards finding peace and happiness together.