Question

My new coworker, a Muslim,is actually quite nice
bobpursley
Grammar, Grammar, Grammar. Comprehensive or not, it is spelled grammar.

What is your question?
GuruBlue
"co-worker" should be hyphenated.

However, I think the sentence, itself, is inappropriate.
PsyDAG
It still needs a period and a space after the comma. In writing and life, details make a difference.