You're right that there are more laws than any one person knows. There are also complex interactions between laws and interpretations of laws such that even diligent legal scholars acting in good faith would struggle to do complex actions without arguably violating some law. I definitely believe the law should be simplified and clarified to improve comprehension.
However, there is a world of difference between unwittingly violating subsection III A.15 of some act you've never heard of, and intentionally bribing a government official. In the latter case you are intentionally suborning the function of government for your own benefit, and corrupting the whole system thereby.
Bribery is inefficient. Systems that operate according to law are safer, cleaner, and more productive. The only argument in favor of bribery is that in the short term, the specific criminals involved, get what they want. That's not a great argument when compared to the harmony and productivity of a society.
Bribery is illegal for a reason. If you can't do business without committing a crime, then you shouldn't do business. If India's culture has rampant bribery, then firms from less bribery-inclined areas should not do business there. Either other countries will come around to India's policy of bribing people, or India, desirous of commerce with the outside world, will come around to the "Bribery is bad" school of thought. In either case, whole societies will be enriched and improved.