Why do you think it's a matter of it "hard?"In which case, why is it so hard to say that 200+ Christians were killed by Islamic terrorists?
Why do you think it's a matter of need? Why would "Easter worshippers" be more offensive than, say, "Christmas shoppers?"Why is there a need to say "Easter worshipers" instead?
We wouldn't?You wouldn't say that Ramadan worshipers were killed, or Eid-al-Fitr worshipers were killed, or that Yom Kippur worshipers were killed, or that Diwali worshipers were killed. You would say that Muslims, Jews or Hindus were killed.
I assume your "you" doesn't include the BBC, the Associated Press, or ABC:
Fake Persecution Scandal Erupts Over Obama's 'Easter Worshippers' Comment About Actual Persecution | RELEVANT MagazineIt was only a few days ago that the AP called those mourning the closure of the Notre Dame Cathedral as “Easter Worshippers.” The BBC referred to Muslims who were killed in their own spate of terrorist attacks in 2017 as “Ramadan worshippers.” Reuters referred to Muslims injured in another terrorist attack in London as “mosque worshippers.” ABC News called Jews slain in the Pittsburgh attacks as “synagogue worshippers.”
I just did a quick Googling - it seems that most stories about deaths on the Hajj use the phrase "Hajj pilgrim," not "Muslim."
Here's an article about an incident last year doesn't use the words "Muslim" or "Islam" at all. It only ever describes the dead as "Egyptian hajj pilgrims:"
Death toll of Egyptian Hajj pilgrims rises to 58 - Egypt Independent
On a scale of 1 to 10, how triggering do you find that article?