Why is it that intellectualism and spirituality are so often put into opposites?

I've been at some theosophical meetings and I was surprised how eagerly they embrace any scientific item while they are a religion still, they were discussing the double slit experiment and its implications for that matter. After that they tried to fit that into their guidelines, not to serve their guidelines but to complement the two sides into each other, as if it cannot and should not be opposite things, as if they principally put that they must be talking about the very same thing in the end. I'm not suggesting they succeeded in the co-ax but there was an intellectual opening within spirituality as a fundament. It's possible.

Vise verse:

Wise Guy Thinks He Can Prove God

Well that was a funny spin

But what I wanted to aim at is, in the end spirituality and intellectualism can and should meet at some point if they both are flexible and willing enough.

If "The Old Book said" is the only and ultimate definition of spirituality, then the problem lies exactly there by framing the term into that. This might be the consensus alright

If a shaman sings an Icaro and I feel better I need nobody to say it's BS and I have no problem accepting that once later it might be explained by quantum physic relationships and I would love to see that happening. Wouldn't that be something!