What is "superstition"? How does it differ from something which is not superstition?
In our country we had very many beliefs with which crores of people lived and died for many thousands of years. Nothing bad happened to them. Then the Englishman came and he found that many of his beliefs (call them superstitions, to be honest) are different from ours. Since the Britishers thought we were uncivilized tribals, they as the rulers could call our beliefs as superstitions and joke. Now we are ourselves doing that just like faithful servants of the British.
Made snaana is a ritual which has been observed for hundreds or thousands of years; we should better follow those practices instead of trying to analyze. It will be like pulling a sprouting seed from the ground every day to find out where its root has reached up to.
After all there is no compulsion on people that they
must do it.