Coming from a moderate muslim family, my life actually got a huge upgrade when I realised God doesn't exist (at least the way religions describe it).
Le genere humain ne sera heureux et libre que quand on aura étranglé le dernier roi avec les boyaux du dernier prêtre.
Or, in plain English: Man will be happy and free only when the last king has been strangled with the entrails of the last priest.
However, I like to complete it with a quote from Voltaire [1]: L'univers m'embarrasse, et je ne puis songer - Que cette horloge existe et n'ait point d'horloger
Or, in plain English: The universe baffles me, and I cannot conceive - That this clock exists, yet has no clockmaker.
[0] https://www.persee.fr/doc/rde_0769-0886_1991_num_10_1_1097[1] https://fr.wikisource.org/wiki/Page:Voltaire_-_%C5%92uvres_c...