Celestials and Thanos-Eternals-Infinity War-Endgame

[SPOILERS FOR THE FOLLOWING{spoiler flair is missing}:

Marvel's Eternals - COMPLETE

Endgame

Infinity War]

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Hi all. I recently finished rewatching Endgame and have realized a potential loophole in the "snap" and how future groups of heroes we see today are impacted. But before I can expand upon this, some questions need answering and I haven't found enough official MCU content that supports the theory strongly enough.

The questions needing to be answered are:

1.) Are Celestials counted among those snapped in Infinity War?(Evidence on Peter Quill confirming this is debatable due to his half humanity.)

2.) Why didn't Arishem or other Celestials attempt to stop Thanos? (Based on Arishem's statements of the need for new Celestials to be "born" every few million years, and what we know are the qualifications for an Emergence, his actions directly impact the cycle of Celestial births to an unimaginable degree.)

3.) Are the Eternals counted among the lifeforms that can be snapped?

4.) If both the Celestials and Eternals, or at least the Celestials, are counted amongst those who can be snapped, could the reason for a lack of response from Arishem be that he was snapped for 5 of our years?

EDIT: Found the spoiler flair, I'm just dense.