Most of them believe that Buddha went to outer space, met angels called devas and received secret knowledge from said 'angels'.

Uh... Not a single Buddhist I've ever met, and I've met plenty recently, believes that. Most do not believe anything supernatural at all. And I'm talking about practicing Buddhist monks, one of which has been a Buddhist monk for 20 years and yet still calls himself an atheist (in terms of belief in a deity).

The DEFINITION of a Buddha (not only one Buddha, ours is the last one, Siddhartha Gautama) is one who reaches enlightenment and then proceeds to enlighten civilisation, usually referring to his teachings of meditation. The attitude of most Buddhists I've met, including the monks, has been "just meditate and you'll see the changes yourself" and surely enough, meditation really does seem to lead to a specific set of morals because of the (entirely natural and mundane, yet profound) experiences that it produces, a set of morals that aligns pretty well with Christian morality that founded the western world as well.

I have not been conditioned into believing that biblical stories are ridiculous to believe in. I know some buddhists who believe in some supernatural things, and I personally find it ridiculous as well. Islam is far more ridiculous than Christianity in its mythological stories that it expects people to genuinely believe in. People's skin turning into bronze and their blood turning into molten metal in hell, djinni, Mohammed's bipolar and arbitrary rulings, etc.