There are two answers: An atheist answer, a believers answer
Humans like to believe in different concepts because their brain is curious and wants to find out answers about something that is unknown.
Once they come up against questions that can't be answered by science or any other theory then they tend to come up to their own conclusions mostly based on what they believe in or whatever their imagination lets them decide in the end.
This is where religion comes in. A lot of people who don't have faith in their own imagination will want to follow somebody else who is convincing enough. Thus, following a religious messenger etc.
So the point of religion is to serve this basic need of human beings in believing or following something that they can't quite understand.
A believers answer:
Since there can be so many deviations and so many concepts regarding what could be the unknown, how the universe came into existence, Who made it all.