The existence of a personal God is obvious to millions of people in many different ways, and is completely opaque to millions of other people. I have no way to understand or explain this partiality. Nor am I very much interested in doing that.
As far as I am concerned, God’s existence is obvious every time I see love and laughter, caring and kindness, I enjoy music and mathematics, listen to poetry and prayer, exchange gifts and greetings, embrace and shake hands, shed tears of compassion and joy, delight in fruits and flowers, watch bees, birds and butterflies, realize I can feel fur and taste sweets, and I wake up after a night’s sleep…… These are some of the ways God (of whatever kind) is obvious to me.
I have read a lot about God in many contexts which prompted me to write
Ubiquitous God: God Everywhere in human culture
https://www.amazon.com/dp/1791741657
But I have never seen or understood any of the Gods described and proclaimed in sacred books, as many seem to have.

It is a very good question in the first place why God should not be a reality as obvious to everybody as for example gravity, which also cannot be seen as an object, but the effects of which can be experienced and observed by everybody. The conundrum might be more tractable if we consider, that gravity is the best explanation we have for a certain host of consistent experiences and observations. God, however, is an explanation for a boundless plethora of experiences and observations, for everyone of which there is also another plausible and possible explanation, while the observations of the effects of gravity can only be explained by gravity. God is, in other words, never an observation per se, but only an explanation. Consciousness, on the other hand, is clearly only an observation, but not an explanation. And right in the middle on this axis between God as pure explanation and consciousness as pure observation sits the most enduring problem of philosophy: free will. It is as much an observation as it is an explanation, and therefore, even more than God or consciousness, rife with endless debate.
Thank you for you insightful comments on the question.
V. V. Raman
2 April 2019