A difference in treatment may be lawful in employment situations if:

belonging to a particular religion is essential for the job: this is called an occupational requirement. For example: a prison chaplain serving Methodist prisoners may need to be a member of that faith
an organisation is taking positive action to encourage or develop a group of people with a religion or belief that is under-represented or disadvantaged in a role or activity
a faith school appoints some of their teaching staff on the basis of their religion
an organisation with an ethos based on religion or belief is restricting a job opportunity to people of their religion or belief. For example, a Humanist organisation which promotes Humanist principles and beliefs could specify that their Chief Executive must be a Humanist. However restricting a job opportunity to people of a certain religion or belief is not lawful unless the nature or context of the work demands it
the circumstances fall under one of the other exceptions to the Equality Act that allow employers to provide different treatment or services based on religion or belief
A difference in treatment may be lawful in situations outside the workplace such as if:

a faith school is using religious criteria to give priority in admissions to children from a particular religion.
a religious or belief organisation is restricting its membership or participation in its activities, or the provision of goods, facilities and services to persons of a particular religion or belief. This only applies to organisations whose purpose is to practice, promote or teach a religion or belief, whose sole or main purpose is not commercial. A restriction can only be imposed:
if the purpose of the organisation is to provide services to one religion or belief
if it is necessary to avoid causing offence to persons with the same religion or belief as the organisation
an organisation is taking positive action to encourage or develop a group of people with a religion and belief that is under-represented or disadvantaged in an activity
the circumstances fall under one of the other exceptions to the Equality Act that allow organisations to provide different treatment or services based on religion or belief
“When I encounter the MyAngelNumbers 777, I feel a sense of spiritual guidance and inner wisdom.”