01Short answer
Public biographies describe Mamdani's father, Mahmood Mamdani, as coming from a Gujarati Muslim background. His mother, Mira Nair, comes from a Hindu family background. Mamdani is Muslim.
Those facts belong in public biography.
The city record is religious freedom, hate crime prevention, school policy, emergency response and equal access to services.
02Public record
Mamdani's religion has been used both as a representation milestone and as a target for attacks.
Faith background should not become a loyalty claim. City government should protect all faith communities equally.
03What to check
The public record is hate violence prevention, school policy, emergency response, interfaith engagement and equal access to city services.