The changes occurred or consciously made are absorbed and imbibed by the following generations. They may also amend or shed those traditions and even may add new styles. Even in the same generation there can be various changes.
This is happening for so many centuries and/or millenniums. So the title statement "Old beliefs and traditions can be modified with rational and logical mind" is just a reiteration of a happening fact only.
K Mohan @ Moga
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease
Irrespective of religion, caste or creed every person is looking for logic in every aspect. But finally, it is proven that the changes that are taking place are only a modified version of earlier practices. Change is a continuous process and it is definitely for the betterment of mankind.