It may be a cliché, but it's true: There's an app for everything, including praying to God.

One such app is Hallow, a popular Catholic prayer subscription service downloaded by millions of users, including celebrity partners like Gwen Stefani.

Stefani has been a Hallow app partner for the last year, but its only recently that her social media promotion gained enough traction to incur the ire of fans and fellow celebrities en masse. In a Dec. 1 Instagram post, the No Doubt singer once again plugged the app for the start of this year's advent season, urging followers to join her in its daily prayer challenges. In follow up responses, podcast host Matt Bernstein, reality TV star Chrishell Stause, and other social media commenters pointed out what Stefani didn't: That many of the app's praye

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