2 of 3 Corrected typo

Kiddush/chillul Hashem taken to mean showing the world that this is how Hashem's chosen people behaves:

No, by definition: The gentile cannot be representative of a group he does not belong to.

Kiddush/chillul Hashem taken to mean letting one self be killed rather than doing something forbidden:

It depends (see Sanhedrin 74b). If non-Jews are obligated in letting themselves be killed, then - Yes, by definition: If that is the label of an act, and he did that act, then it has that label.*

If non-Jews are not obligated in letting themselves be killed, then - No, they cannot perform the act of sanctifiying Hashem's name by being killed when they have no command to do so.


* My head spins from reading my own words!