God is one. But it is also true that He is everywhere.

Anek hai phir Ek hai

For example. Gold metal is one but we can make different types of jewellery from it i.e. Ring, Chain, Mala etc. Still Gold is one and in every jewellery.

One more example: I can be Chacha, chachi, taya,tayee, Husband, wife, brother or sister. Still I am one.