Basis of religion-fear or enquiry

It is conventional wisdom now that fear seems to be the basis of faith. But the way I have seen, there is also one additional element to it-the intense enquiry into the nature of reality. In the Indian systems, whether upanishads or buddhism or Jainism, there has been a sense of puzzling bewilderment towards the self (if we assume it to be common sense self meaning an individual) and that which is sourrounding it in space and time. There are many hymns which are directed towards protection from fears, but at the same time, there are hymns which are almost restlessly enquiring what is all this? Where from it came? What is life and what is death?
Where as atheism and theism both sought to confirm or deny the existence of a mental concept, the truly sincere enquiry into reality inevitably leads into the issue of 'self' and 'non self'; 'changing and changeless' and a more incessant analysis.
However, those who enquired into this and reached to the principle, which they called as the supreme, even they were not unaware of the role played by fear and want in the religion of many. Hence the classification of devotees into - artah (scared), artharthy (desirous of wealth or happiness), jigyaasu (enquiring) and gyaani ( the enlightened)