Hello Sundeep......IMHO, human beings can and do change their ways of thinking......believing.....at any time for many reasons.
What we learn (are taught), our own experiences in life and all that we can see, hear and touch, are left to our own perceptions.and abilities to reason.
One may adopt a way of life, an agenda or allegiance in a particular manner and walk down that path for a period of time. However, due to events, acquired knowledge, inspiration or due to in depth research....may see these things in a new light, with different meanings and this can cause a shift in thinking.
From Theist to atheist.....or vice-versa can be not terribly unlike a change in political views....or an alteration to one's personal codes and constitution.
We have free will and the ability to use our intelligence to make decisions and choices,all throughout our lives.
These human capabilities can be a wonderful blessing and/or a lethal curse.......depending on how it is used and put into action. I don't believe it is for any one individual to judge the heart & mind of another........except of course in matters that directly effect life & death.
You have asked a very deep and complex question, my friend.....with answers of equal depth and complexity.
A debate panel could easily spend endless time and opinions on this single topic.I would LOVE to be a member of such a panel!
I hope my response will suffice for now. Thank you, Sundeep.