Can Christians or non-Muslims say astaghfirullah?
The word means "I seek forgiveness from Allah." Non-Muslims can quote or study it. Regular use as personal worship is a Muslim practice.
Detail
Arabic-speaking Christians use the word Allah too. In language terms, no one owns a word.
In practice terms, astaghfirullah is an act of dhikr. It comes with an implicit theology about who Allah is and what forgiveness means. That is a Muslim frame.
There is no ruling that forbids a non-Muslim from saying the word. There is also no reward attached to it outside the frame of Islam.
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