If you believe in God you have been endowed by your creator with certain unalienable rights.
If you do not believe in God, you cannot have those rights because by denying God exists you can not receive rights from an entity you claim does not exist.
Therefore, while I have the right to life, liberty and the pursuit of happiness, by definition unbelievers do not. Sometimes it can be a downright frustrating to be an atheist. And don’t give me the argument because I believe that, that somehow entitles you to have those rights. By your logic, those rights cannot be endowed.