Isn’t it a fact that nobody can tell for certain how the world began ?

No it isn’t, we know for certain how the world began. Planetary formation is well understood.

The religious have their idea, it suits them and they’ll stick to it.

Indoctrinated ignorance.

Why does it matter ?

For the same reason we no longer burn witches. Willfully ignorant is no way to go through life & is harmful to the continuing existence of the our species.