"If I’m the nominee, Republicans will be sorry," said Biden, a Roman Catholic who ran for president in 1988. "The next Republican that tells me I’m not religious I’m going to shove my rosary beads down their throat." [Source]
The question is not whether he is religious or not. The question would be as a Catholic is he faithful to the teachings of the Church or not. A 17 percent pro-life voting record and support for same-sex marriage doesn’t exactly point to faithfulness. Hopefully me might find another use for his Rosary then simple assault or to at least use the Rosary as a weapon in intercession against the culture of death.