Omni Presence

There is another question that people might have, “How is god everywhere and in everything”?

The best way to understand this is through this shloka from Mundaka Upanishad. 
यथोर्णनाभिः सृजते गृह्णते च यथा पृथिव्यामोषधयः संभवन्ति । यथा सतः पुरुषात्केशलोमानि तथाऽक्षरात्संभवतीह विश्वम् ॥ (1.1.7)

While this shloka gives many examples, let use one of them to explain.

Just like a spider makes the web from himself, moves around it, and finally eats it away, same way Brahman makes the universe from itself, and when time is done, dissolved it back into himself.

This means, this universe is made by Brahman (God) from itself, so everything here is all Brahman, including you, me and everything/everyone around us.

Another way to look at it, through this shloka from Bhagavad Gita (9.7, 9.8):
सर्वभूतानि कौन्तेय प्रकृतिं यान्ति मामिकाम् | कल्पक्षये पुनस्तानि कल्पादौ विसृजाम्यहम् || 7||
प्रकृतिं स्वामवष्टभ्य विसृजामि पुन: पुन: | भूतग्राममिमं कृत्स्नमवशं प्रकृतेर्वशात् || 8||

At the end of the kalpa, whole universe merges back into me, then again at the next kalpa, I re-create everything. This continuation of dissolving and re-creation, goes on forever.

So, to answer the question, the Brahman (God) is everywhere as the whole universe is made of it.