Unlikely, it seems that that’s the wording according found in multiple hard copy sources according to Google Books. See for example this magazine article All the online copies (and there are many) have the word “Sheikh” there.
A Google search for “The Irish, the Rabbi, the Priest, the Sikh” turns up no hits from a Google search which means that all online copies would have the poem this way. This seems unlikely for a transcription error.
(Incidentally, apparently the correct title of the poem is “On the Pulse of Morning” although many websites list the title as “The Rock Cries Out to Us Today”)
Unlikely, it seems that that’s the wording according found in multiple hard copy sources according to Google Books. See for example this magazine article All the online copies (and there are many) have the word “Sheikh” there.
A Google search for “The Irish, the Rabbi, the Priest, the Sikh” turns up no hits from a Google search which means that all online copies would have the poem this way. This seems unlikely for a transcription error.
(Incidentally, apparently the correct title of the poem is “On the Pulse of Morning” although many websites list the title as “The Rock Cries Out to Us Today”)