Of course. However sometimes this will appear to be illogical. My mother hasn't gone to church for decades and has no interest in going. However, she will claim to be Roman Catholic and fight tooth and nail to keep that designation. The irony is that Roman Catholicism teaches that by not attending church she is in the state of mortal sin. This demonstrates some of the social context of affiliation with a relation, apart from theological arguments.
They practice Islam religion.
They practice Roman Catholic religion
Buddhism is the religion. Buddhist practice Buddhism.
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
They built temples to practice in them
Traditional tribal religion.
the religion of Aztec's is they practice sacrifice
He was Catholic but was did not practice the religion.