Hundreds of activists are aboard the Global Sumud Flotilla with the intention to bring humanitarian aid to Gaza.
Archived version: https://archive.is/newest/https://www.dw.com/en/flotilla-with-greta-thunberg-on-board-sets-sail-for-gaza/a-73828282
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It appears she has not shared her private thoughts on religion. One can speculate, like you did, that she is not a religious person.
It’s probably for the best. Religion is a private matter and I think it should be performed in private.
I mean I have no problem with people saying what their religion is, but strategically it’s probably much better for her not to disclose her religion, since that would open herself to a whole other line of attacks.
If she hasn’t mentioned it at all, I’d say it’s most likely she doesn’t have one.
People don’t tend to talk about things they’re not interested in.