When Leo Brunnick and Cathie Frazzini married, they struggled to meld their religious faiths. (Kathryn Scott Osler, The Denver Post )

When Cathie Frazzini and Leo Brunnick met, fell in love, married and blended their careers and families — two young children each — the hardest part of "yours, mine and ours" was religion.

Leo grew up Irish Catholic in Boston. Cathie was a nice Lutheran girl from Buena Park in Southern California who also had explored nondenominational evangelical Christianity.

"You can't randomly choose how to raise your children," Leo said.