Human life starts from believing. Isn't it, please?
Regards
From believing?
I am not very certain about what you mean here, sorry.
Human life, by a certain perspective, starts from the conception, from the joining of a sperm and an egg cells. Or one might well argue that it truly starts from being taken by a social culture and developing both a sense of individuality and a series of relationships with that social culture. There are other valid, alternate perspectives for when human life starts.
I don't know which one, if any, you are addressing with your question.
It is even less clear what you mean by "believing". My first assumption, naturally, is that you might mean "believing in the existence of a Creator God".
But that does not make any sense, at least to me. No valid way of describing the start of human life occurs to me that would involve such a belief, although the perspective of social integration would certainly come the closest.
But even then, even by that perspective, it is simply not at all true that belief in a deity - of any sort - is necessary for the development of a well-integrated, fully functional human being.
Therefore, while my answer is all but certain to be "no", I still have to ask you for some form of clarification or rewording before I actually understand your question.
However: your thread is titled "It is very natural to believe". That gives me a clue of sorts. Again, it feels reasonable to guess that you mean "to believe in a Creator God", or even "to believe in the existence of the one, true Creator God with no associates", given your well-known Ahmadiyya Muslim background.
And to that I can only answer that it is certainly very natural
for a significant percentage of people to believe in such a God. I don't really understand how or why. But it happens.
I do however very much doubt it to be a very common occurrence. It seems clear to me that even most people who claim to believe in the literal existence of a Creator God do so largely out of a need to be accepted by social environments that will give them a hard time if they fail to conform to that expectation.