Three months after coming to work for Steel Bank, Jon joins a religious group whose Sabbath is on Tuesdays. Members of the religion are not to work on the Sabbath. Jon refuses to work on Tuesdays citing religious grounds. He is terminated. Jon sues the employer, alleging religious discrimination. The employer defends by saying that;
1.) Jon was not a member of this religion when he was hired
2.) Tuesday is not a valid Sabbath day
3.) Any religious group that celebrates a Sabbath on Tuesday is not a valid religion and the employer does not have to honor it.
Are any of the employer's defenses valid?