HI Wandrer
Nobody care about your religion in Lahore , its a city of millions, but dont misunderstand this and you must know better as born Paki, that you can not discuss your atheist views in Public place, keep your views up to your home and partner, you should be careful while going to older part of the city, without Hijab , respect local culture, and don't discuss religious views in public, stay at safer and expensive area where people do not bother about your color of kin white or black no matter,
Cheers
Haider