Some of the people giving you responses here are just selling their particular brand of anger and lack of self-control. Laugh at them...they are funny people.
Anyhow...I do not do "believing."
I make some guesses from time to time...but the reason I am making guesses is that I cannot prove whatever it is that I am guessing about. If I could prove it, I wouldn't need to be guessing.
And when I am guessing...I call it a guess rather than try to disguise the fact that I am guessing by calling my guessing...believing.