People as per their faith believe in different Gods. Like, someone has faith in "Lord Rama" & someone has faith in "Lord Krishna". To someone "Lord Shiva" is dear & to other "Lord Ganesha" is dear. Some have faith in Goddess "Durga / Kali" while someone has "Lord Hanumana" or "ayyappan" close to heart. 

In fact God is one only but is known in this world by different names due to faith of different persons in different manifestations of God. But in ,whatever, form you love God, He reciprocates you back in the same way. This has been confirmed by "Lord Krishna" in Bhagwat Gita.

"ye yatha mam prapadyante,
tams tathaiva bhajamy aham,
mama vartmanuvartante,
manushyah Arjuna sarvasah".

"Sri Krishna says to Arjuna: Howsoever, men approach Me & surrender unto Me, even so do I seek them; for all men follow Me & My path in all respects.

So as per the words of God, the only thing necessary in life is to have faith in God & it is immaterial in which form you seek him. If you have faith in Him & you Love Him, then it is for sure that God shall be with you always & shall reciprocate to the Love that you shower on Him.