My new coworker, a Muslim,is actually quite nice

Grammar, Grammar, Grammar. Comprehensive or not, it is spelled grammar.

What is your question?

"co-worker" should be hyphenated.

However, I think the sentence, itself, is inappropriate.

It still needs a period and a space after the comma. In writing and life, details make a difference.

That's great to hear! It's always nice to build positive relationships with coworkers regardless of their religious or cultural background. It's important to treat everyone with respect and kindness, regardless of our differences.

If you have any questions about Islam or would like to learn more, it's best to approach your coworker with an open mind and curiosity. Engaging in respectful conversations can help foster understanding and create a supportive work environment.

Remember, it's always important to approach discussions about religion or any other sensitive topics with sensitivity and respect, being mindful of different beliefs and perspectives.