Why Is Anybody Convinced There Is A God?

Why is intelligence a factor???  Not really sure I understand the question, but I guess you are asking me why do I care???  I think that (given we do not know) at the end of the day we all make a choice as to whether we think an intelligence is involved or not, I choose to think there is.  There is no other reason than personal interpretation and comfort of choice.
My preference is for an accurate view of reality (in as much as it can be), and as I have said previously I defer to science and understanding first, like I say it isnot even really a truth claim it is a matter of interpretation.  To put it another way, even if I knew for a fact that an intelligence was not involved, my model of the universe would still have to change before I abandoned interpreting the universe as if it was sourced from an intelligence. Another way of looking at it is that I don't really care what the final truth is, my model of the universe interprets the source as intelligent, my model would have to change first.  This is why I am very adamant that I am not making a truth claim, I am instead holding a model of interpretation in my head that allows me to come to grips with the reality I face.