How can a man define God?

[Stan]

The universe and God are so vast that human language can only attempt to explain it let alone define it, much like trying to define the boundaries of the universe or what lies beyond it. 

We get glimpse of it thought out the Bible, and yet people get so hostile if others do not accept their findings.

[Gregory Matthews]

We can define God only in terms of what we experience in our human life.  God is not limited by our human experience.

As to the boundaries of the Universe, Science teaches that there is a finite boundary to what we can explain about the Universe and beyond that we can only speculate, in part by mathematical formulas. 

[Gustave]

As finite creations of an infinite Creator we have been gifted more with the knowledge of what God is NOT. God is a mystery and pretty much all heresies about God flow downstream of people attempting to remove the mystery.