"For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth. For what can be known about God is plain to them, because God has shown it to them. For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse" (Romans 1:18-20)
When liberalism, pluralism, and emerging theology speak of the greatness of God as being too much for the human mind to understand, do not think for a second that they are giving any honor to God. They do just the opposite, for they render God as weak and powerless, unable to make Himself understood in any adequate way to His own creation. For example:
"Bahá'u'lláh taught that God is too great and too subtle a Being for the finite human mind ever to understand Him adequately or to construct an accurate image of Him." (From The Bahá'í Concept of God)
This is a self-refuting statement, for how did the mind of Bahá'u'lláh manage to understand this, and how accurate can his image of God be? If this statement were true, then
1.) We could never know it to be true, and
2.) We would have no reason to listen to anything Bahá'u'lláh says about God.
This is what happens when the Holy Scriptures are rejected as God's revelation of Himself. Once someone makes any kind of statement about God, they are acknowledging that He can be known, is known, and that the unbeliever is without excuse.