[RokeIdeadioke]

I am arguing it is rational because it is necessary.

Most people won't die for things/devote themselves for things/put lots of effort into things without believing in them. Yet doing so is how most of our achievements (all?) have came about.

Most things that require action lack sufficient evidence to be true without any belief.

Additionally, I think if you look at philosophy it would be impossible to do any science/engineering/etc without belief.

JM