If evolution is true, why are we devolving?

Most people today hold the assumption that ancient people were less intelligent than we are now. That is one of the arguments atheists use for why belief in God is foolish for modern, scientifically minded people. However, what is accepted as a scientific fact today is discarded tomorrow...and in fact, evidence reveals that ancient people were actually quite advanced. Scientists are still puzzled by how the pyramids were built; the innovations of ancient civilizations are arguably much more brilliant than modern ones. Considering the direction in which humanity is headed today, are we really "improving?"

Musical Notation: Invented By Savages

Even the concept of evolution, which atheists like to use to discredit the Bible, has changed. In the 20th century, people believed in "the survival of the fittest." In the 21st century, the paradigm has shifted to "the survival of those who best adapt to the environment." What's next, "the survival of those who blindly acquiesce to the cult of scientism?" Again, are we really progressing?