Question:
Is it true that God is everywhere at one time and can see what everyone is doing at once?
Answer:
The simple answer to your question is “yes”.
The Bible teaches that God made everything and keeps everything going, and so is intimately aware of all that happens in what he has created.
One poet in the Bible expressed this aspect of God’s being from the following, personal perspective:
Psalm 139:1-16 (ESV)
To the choirmaster. A Psalm of David.
O Lord, you have searched me and known me!
[2] You know when I sit down and when I rise up;
you discern my thoughts from afar.
[3] You search out my path and my lying down
and are acquainted with all my ways.
[4] Even before a word is on my tongue,
behold, O Lord, you know it altogether.
[5] You hem me in, behind and before,
and lay your hand upon me.
[6] Such knowledge is too wonderful for me;
it is high; I cannot attain it.
[7] Where shall I go from your Spirit?
Or where shall I flee from your presence?
[8] If I ascend to heaven, you are there!
If I make my bed in Sheol, you are there!
[9] If I take the wings of the morning
and dwell in the uttermost parts of the sea,
[10] even there your hand shall lead me,
and your right hand shall hold me.
[11] If I say, “Surely the darkness shall cover me,
and the light about me be night,”
[12] even the darkness is not dark to you;
the night is bright as the day,
for darkness is as light with you.
[13] For you formed my inward parts;
you knitted me together in my mother’s womb.
[14] I praise you, for I am fearfully and wonderfully made.
Wonderful are your works;
my soul knows it very well.
[15] My frame was not hidden from you,
when I was being made in secret,
intricately woven in the depths of the earth.
[16] Your eyes saw my unformed substance;
in your book were written, every one of them,
the days that were formed for me,
when as yet there were none of them.