Can you please answer the scenarios and put 1reference each question.

Scenario 1
Mohammed, a member of the sikh religion, wears a turban as part of his religious mandate, including at work. His supervisor tells him the turban makes his co-workers uncomfortable. Must he stop wearing it?
Scenario 2
In his Preemployment interview, Mosley stated that he would not work on Saturdays because that is the day of his Sabbath. As a result, he is not hired. Is this religious discrimination?
Scenarios 3
Three month after coming to work for steel Bank, Jon Joint a religious group whose Sabbath is on Tuesdays. Members of the religious are not work on the Sabbath. Jon refuses to work on Tuesdays. He is terminated. Jon sues the employer, alleging religious discrimination .The employer defends by saying that (1)Jon was not of this religion when he was hired (2) Tuesdays is not a valid Sabbath day, and (3) Any religious group that celebrates a Sabbath on Tuesdays is not a valid religion and the employer does not have to honor it. Are any of the employer's defenses valid?