Regardless of your religious beliefs, you should never tell a mourning mother that it was "God's plan." For some people, that can be worse than saying nothing at all. For a non-believer, the words that are meant to console a religious person can do quite the opposite.
David G. McAfee, Mom, Dad, I'm an Atheist: The Guide to Coming Out as a Non-Believer
atheist, god-s-plan, grief-beyond-belief, religion-and-grief