Hi! I think your misunderstanding comes from the fact that religion, is not a mechanism for creating new knowledge, it is a collection of shared beliefs between people.
A better comparison would be faith VS science, or religion VS scientific understanding.
While most religious beliefs are faith based at their core, it's easy to speculate that certain religious and cultural stigma arose after repeated observation of the natural world (Alice ate shrimp, Alice falls ill -> eating shrimp is against the will of God). Not as efficient as controlled scientific testing, but it ultimately lands you on the true statement "Eating shrimp is unwise and likely to get you sick".
The pyramids were built over two thousand years before the coliseum. Saying they are of the same time period is like claiming the Eiffel tower and the coliseum are of the same period too!