I don't think there is a generic "it" type of thing which causes such attribution as "God" something or other. Like in science, technically isolating a variable - that's not the way.
Rather theism is a mind-set, a priori approaching the world in a certain way with selective attention*, and all creation (or neutrality perceived as such) has something to do with God in some way - to grater and lesser degree acknowledged from situation to situation.
Things are more like signs, like in phenomenology where worldly objects indicate this usage, many sidedness etc. for me phenomena indicate the wonder of existence, at times of focus, God included. Like an atheist staring at the milky way with awe, its not a guaranteed experience, more like an aesthetic one where an 'aesthetic attitude' you bring to the situaiton makes a contribution.
One "sign" can be emotion and intuition, with theism ingrained in the psyche, abandon all thoughts and let ones feelings guide; like a form of psychic power in cooperation with God-consciousness.
Another "sign" might be a squally wind, appreciated in a different way.
Another may be the coping power religion assists with.
Another may be the tranquillity and focus in prayer, or in sufi "zikr" - where the quality of truth is a sign...
All of these may "cohere" in forming a general sense of God and truth in religion... rather than one "type" of fact causing faith, the attitude-lifestyle matrix is self reinforcing as a social and psychological whole.
*
Theres a quran quote long the lines of
unbeliever "you didn't guide us"
Allah "no, you didn't listen".
If you listen to the quran in the vid, you have to bring faith and lifestyle with you, to properly appreciate the "light" (noor) of the quran, and the world around us. Like I have Islamic art and light tea lights in my flat, which helps with the sense of "noor"....(may seem false to you, but its down to selective attention and guided action - imagine all those nasty predicaments I have avoided whilst I appreciate the sense of noor!) - Allah loves the believers, not the unbelievers...
Although I am a peaceful person (astagfirullah for any evil stirring I don't want to cuase *any" trouble whatsoever), I admittedly feel like a bit of a ninja sometimes - the faith reminds me of the aikijujutsu spirit, not for its violence but its powerful elegance and stylistic beauty.
A teacher of aikido once told me its like 3 things: tea ceremony, swordsmanship and flower arranging.
]So Ill end with a friendly salam: