Oh absolutely- if you have a god of the harvest, you go to them to ensure a good crop, if you have a god of commerce, you go to them to bless a business venture- D&D wants people to be devoted to one god, whose worshipers all have the same basic powers as other god's faithful, so each god is a "one stop shop" for all your divine needs!
In ancient times, you could have your household god or gods, patron gods, gods who are appeased and gods who are actively worshiped and there were scores of deities who actively had a hand in one's life!