well from the C AB site:
so I erm allege that discrimination on religion is unlawful
Religious discrimination in the workplace and training
You are protected from religious discrimination in your workplace. This means you are protected:
whatever your religion or belief
whatever your employer's religion or belief
whether you are already working for your employer
whether you are applying for a job.
Discrimination at work because of your religion or belief could include:
dismissing you because of your religion
advertising for job applicants of one religion only
requiring you to dress in a certain way, for example, requiring all women to wear a short skirt. This would not be acceptable for women of several different religions
requiring you not to wear sacred items. For example, a Sikh man might be required to remove their kara (symbolic bracelet). However, if the employer can justify this on health and safety grounds, this wouldn't count as discrimination
making you work at times that you cannot work because of your religion
victimisation
bullying at work because of your religion. This is also known as harassment.
If you experience discrimination at work because of your religion or belief, you may be able to make a complaint. This includes raising a grievance with your employer or making a claim to an employment tribunal.However, in some circumstances, it might be possible for your employer to show that there were genuine business, or health and safety reasons for the way you have been treated which have nothing to do with your religion or belief. If this is the case, it won't count as discrimination.