Take the Freud's unconscious. Despite all criticisms made against him on purely scientific grounds (not that i believe in absolute truthiness of scientific methods), his idea of the "unconscious is intact," as per professor Bloom of Yale. Unconscious is fascinating. All the slip tongues, memory gaps, and other crazy stuff comes from unconscious of which we have no conscious trace or understanding. Still its there. A better example than this is gravity that we can feel but don't observe the way we want to observe God, which is impossible for our perceptions.
The simple logic behind believing in these unobservables is their fruits, to be poetic. Then how we deny the Creator? Dr Asad Zaman in his lecture on logical positivism [lecture # 7] shows how these atheistic scientific theories are so grounded and motivated by this urge of non-believing communities to deny the Maker of the Universe. This logically explains their consistent efforts to deny Allah despite their admission about existence of life and universe being nothing short of a miracle. Allah shows the disbelieving miracles but they deny, as their predecessors did. Allah knows best.
Sidi (late) Charles Gai Eaton shows difference between a Muslim-believer and modern agnostic/atheist western's approach towards faith:
"Formerly, this confrontation [b/w Muslims and Christians in middle ages] was between men of faith who had more in common than they could ever have acknowledged. That likeness, that shared devotion to an almighty and unseen God, no longer exists. The gulf has become infinitely wider and mutual comprehension has become far more difficult. The believer to whom the transcendent reality of God is the most compelling fact known to him cannot really understand unbelief or imagine its sterility. The unbeliever, try as he may, cannot even guess what the experience of faith is; his imagination is baffled by this strange, other-worldly phenomenon."