I know that many hindu philosphers believe God can be known only through scriptures.
Brahma sutras also try to explain logically about nature of brahman etc..
Any place where the problem of improbability of a creator him/her/it being more complex is addressed?
The summary of the problem is stated by Richard Dawkins in God Delusion in 4th chapter Why there almost certainly is no God:
1 One of the greatest challenges to the human intellect, over the centuries, has been to explain how the complex, improbable appearance of design in the universe arises.
2 The natural temptation is to attribute the appearance of design to actual design itself. In the case of a man-made artifact such as a watch, the designer really was an intelligent engineer. It is tempting to apply the same logic to an eye or a wing, a spider or a person.
3.The temptation is a false one, because the designer hypothesis immediately raises the larger problem of who designed the designer. The whole problem we started out with was the problem of explaining statistical improbability. It is obviously no solution to postulate something even more improbable. We need a 'crane', not a 'skyhook', for only a crane can do the business of working up gradually and plausibly from simplicity to otherwise improbable complexity.
If the argument of this chapter is accepted, the factual premise of religion - the God Hypothesis - is untenable. God almost certainly does not exist.