The Boston Archdiocese’s largest effort in a generation to reach lapsed Catholics is drawing wandering souls back to the church’s open arms, but the biggest obstacle could be keeping them, priests and parishioners say.

The archdiocese, still suffering fallout from the clergy sex abuse crisis and parish closings, is hoping to bring back thousands of the formerly faithful through Catholics Come Home, a series of TV ads airing during Lent, coupled with a grass-roots push at parishes. Fewer than 20 percent of Catholics in the Boston area attend Mass each Sunday, down from nearly 80 percent in the 1960s.

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