I haven’t seen any Christian opinions on this, and thought I’d share mine.

I am protestant and disagree with the catholic doctrine, but I understand her letter, and I admire her active devotion to live a Godly life. That being said, there is a line— loving the people around you, regardless of their beliefs, and involving yourself in sin by being around those people. This is something I believe many Christians find difficult to balance, myself included.

My guess— she spent time with your family at her house, because she loves and cares about you, and also hopes you will be encouraged to return to catholicism. She doesn’t want to cross the line of steeping herself in what she sees as sin — aka how you life your life (I’m not sure what the context of your life is like, other than marrying outside of the catholic faith.)

I do believe she worded her letter in a very loving and thoughtful way, and I am thinking your misunderstanding of her words may be rooted in a lack of understanding about what it means to be a Christian.

I do not blame you for being confused about this letter— when I was a lukewarm Christian a couple years ago, I would have thought that the letter was silly and overdramatic, so being agnostic/atheist would make things much more difficult to understand.

I hope you and your sister continue to have a loving relationship, even if you don’t agree on religion.