These are all the matters of belief only and if one does not believe in these rituals then doing it is just for show off in society. These rituals and customs have great history. In old times there used to be a social system in which Brahmins were supposed to do the formalities connected with the rituals at the time birth, death, marriage, or any other function or religious observations in the family. So, they were facilitating us in getting these things done through them in a precise and prescribed manner. In lieu of their service we were giving them some money or material. So, this was a good way of giving a livelihood to the Brahmins and remembering the ancestors in a beautiful manner. Practically what we were doing was a type of donation to the Brahmins within the ambit of those prescriptions. No one knows whether it satisfied to our ancestors or not.
Knowledge is power.