The God Almighty is omnipresent, omnipotent and omniscient.He is everywhere. Nothing else is present anywhere except him.But we see different colors, shapes and all sort of varieties. This is other aspect of of that only one God which we sense in variable forms.
What modern science says ?? There are only two things , one is matter and other is energy. We accept it. What matter is ? Particles - protons, electrons, neutrons, bosons, mesons, photons etc. Energy is also of many types - electromagnetic, heat, mechanical, light, sound, etc. Energy can be converted from one form to another and matter can be converted into energy. We can say that whatever exists is one form of energy as a resultant. It is one.
We sense as per our sensory organs. Eyes sense light.Ear sense sound. Skin senses mechanical contact and temperature. These organs sense variety, which is an illusion.Because actual fact is that everything is ONE. This everything is God or Adwaita Tatva, Parabrhma, the Supreme Authority, Almighty, Allah, Parameshwar, Bhagavan, etc.Names are many.
He says that though I am everywhere and I am everything, You do not have ability to see me as Formless. Hence I tale you some names, see me in them. For example Rama, Krishna, Jesus Christ, Prophet Mohamed, Gautama Buddha etc. See me in them if it is not possible for you to see me everywhere.
It is not a mystery that all religions are equal or same. The fact is that God is one hence religion is also one.Difference is in appearance, language, rituals etc.The core of all religions is the God which is one.
Jaya Jaya Rama Krishna Hari