Which of the following is NOT a source of cultural differences due to religion?

Government regulations are not a source of cultural differences due to religion because they typically stem from legal frameworks and political systems rather than religious beliefs or practices. While these regulations may be influenced by the predominant religion in a region, they are formalized laws that apply to all citizens, irrespective of their individual religious affiliations.

In contrast, religious festivals are significant in shaping cultural differences as they often reflect the values, beliefs, and practices of a specific religious community. Daily and weekly routines can also be impacted by religious observances, such as prayer timings and dietary restrictions, which vary across different religions. Lastly, people's perceptions about their environment can be influenced by their religious beliefs, affecting how they interact with their surroundings and interpret experiences.

Thus, while government regulations might be influenced by religion, they do not inherently originate from cultural differences tied to religion itself. This makes the option about government regulations distinct from the other choices, which directly relate to the influence of religion on cultural practices and societal norms.