A legal challenge over plans for two new Catholic schools in the London Borough of Richmond is being heard at the High Court.
The British Humanist Association and another group claim Richmond Council broke laws in approving new schools which can prioritise Catholic children.
The schools, one secondary and one primary, are due to open in September.
The council says a democratic decision was taken to approve the schools.
It says it is confident it acted lawfully in approving plans for the schools put forward by the Diocese of Westminster. Families have already applied for places at the schools.
In August, the High Court gave permission for a judicial review of the case, which is now being heard.
More top news
Some 26 schoolchildren who went missing in the Brecon Beacons during a Duke of Edinburgh exercise have all been found safe and well.
Charaf Elmoudden went to the singer's four-bedroom house in north-west London last year and made off with goods worth more than £200,000.
The plea has been postponed in case where man is accused of dismembering a police officer he met on gay dating website Grindr.