A view of Holy God, Theology and Scripture as being "simple" is an unfortunate view. These things are not simple. This view sends one toward a simple theology, one that is raw and lacks depth. Typically those who embrace this cast off as trivial any deeper thought from those devoted to knowing God through study, seeking after Gods Glory and knowing Him in a greater way. This attitude is contrary to the attitude of 1 Timothy 5:17; "The elders who rule well are to be considered worthy of double honor, especially those who work hard at preaching and teaching." Those devoted to teaching and preaching and study are to receive not only honor, but double honor (KJV), not the cynicism seen within this thread toward such.
There is usually a proof-text that comes along with this to prove that being simple is akin to godliness and a supposedly "more noble Christianity." This proof-text is 2 Corinthians 11:3; "But I am afraid that, as the serpent deceived Eve by his craftiness, your minds will be led astray from the simplicity and purity of devotion to Christ."
The word translated "simplicity" doesn't mean what this proof-text is used to prove, as it isn't the typical meaning of simple, or "easy to understand." To use this text to color all things God and all things Theological as simple is doing disservice to God and His Glory.
The reason people think it is easy to understand (Scriptures) is because they haven't really studied it out much, generally the study is a topical proof-text journey with not much weight. This is why it is difficult to progress in dialogue and debate as too many are spinning their wheels theologically on some proof-texts and not advancing in knowledge as commanded; 2 Peter 3:18; "but grow in the grace and knowledge of our Lord and Savior Jesus Christ. To Him be the glory, both now and to the day of eternity. Amen."
The statement that it (Bible, God, Theology) is simple reinforces Iconoclasts OP of the problem with church-goers lacking any real devotion and great knowledge of the Scriptures. There is not much growing going on, most have just enough verses tucked away, thinking they know what they mean, and are generally using them as weapons, not light.
- Peace