The source of Power ,the only one invisible, omnipresent God has empowered these representative God and Goddess to do their duties allotted to them exclusively. These purpose Gods/deputed representatives-Like-Lord Shankar(Killer God),Vishnu(God who brings up),Brahma(God who gives Birth),Gods of air ,water ,fire,Goddess Durga ,Kali,Hanuman etc perform their duties accordingly.They are illuminations -like bulbs, mercury,lamps,to glow visibly.If we worship the glowing bulbs, mercury,lamps then also we can reach upto the omnipresent ,invisible the only one God because Source of Power is same.However, to worship the Guru/the competent religious teacher, is also the best way to worship the only one invisible god,who is totally liked to the God and it is the easiest way to receive the grace of the omnipresent invisible God ,through the competent religious teacher.I have tested it so I know it