In fact the ratio cannot be calculated because there can be...
In fact the ratio cannot be calculated because there can be no ratio between a finite and infinite amount. Regardless, human life depends upon all its known and unknown causes and conditions and the system that reigns over the whole of creation also governs humanity as opposed to the compact system that humans perceive using their infinitesimal knowledge.
The relationship between life and the supernatural [māwarā’ al-tabī‘ah] Causes and conditions that hide behind the veil of human ignorance are called “the unseen or supernatural” [ghayb or māwarā’ al-tabī‘ah]. If a series of knowns and unknowns are combined, they would still be veiled and invisible. All that we know of the supernatural world is the existence of a veil and that there is something behind it that is not unrelated to our lives.
Humans cannot disregard the fact that our lives are related to the unseen nor can we content ourselves with only causes and conditions that are known to us. Even those who ridicule belief in the unseen and supernatural as a superstitious religious belief and insipid relic from the Age of Myths pragmatically accept and are humbled by this truth. In the process of life, they are not exempt from the effects of supernatural causes and cannot be nonchalant about unexpected incidents.
Even so, faithfulness to the existence of unseen effects does not mean that one should give up the effects of knowledge and devices at hand, awaiting supernatural aid. In truth, this is sacrifice of knowledge in favor of the unknown—something that reason cannot sanction. In fact, our realist mechanism that notifies us of the unknown behind the veil also informs us of the effects of what we know and forces us to use them.
Divine religions invite us to believe in the unseen and supernatural and also endorse the products of work and toil in our lives. The Qur’an repeatedly bids us to believe in unseen effects.