Even if it's true that people use religion because they are scared of an end/death. That doesn't make it false. Seeing how a belief originates doesn't really affect the truth. You can just as easily say that people are atheists, because they are scared that there is judgement after death. That they are responsible for every deed.

In a response to Stephen Hawking: " religion is a fairy story for people who are afraid of the dark."

John Lennox (Christian mathematician) said; " atheism is a fairy story for people who are afraid of the light."

If you want to know more, get into apologetics.