Most Athenians were believers in Greek Mythology. Athenians in particular dedicated the Parthenon to Pallas Athene.
They practice Islam religion.
They practice Roman Catholic religion
Buddhism is the religion. Buddhist practice Buddhism.
democracy
It is entirely up to you, how seriously you wish to practice your religion.
they practice the religion of pakarah, a ancient religion that revolves around the sun as the centerpiece of life.
I guess you ment " what religion do hindu's practice?" If so, it is Hinduism.
Europeans mostly study (practice) the catholic religion.
vedic religion
Traditional tribal religion.
the religion of Aztec's is they practice sacrifice