Our Magisters have provided some perfectly sensible and somewhat amusing, answers. I'll be boring, and answer your questions.
1. Do you believe that someone who isn't your religion can go to paradise?Paradise meaning...?
Satanists believe that life begins and ends here on Earth, simply because there is no convincing evidence to the contrary. Being hedonists, if you give us a peek at the 'afterlife' and it looks sexier than we had imagined, we may just have a change of heart and change our ways to get there.

Of course, we're still waiting for the ad that really 'sells it.'
2. Is there only one god?Actually, there are so many 'gods'. That's actually an easy question.
No, there are tons of them.
The debate lies in proving one is 'more real' or 'more potent' than another. That's a tough one.
3. What other religion do you most associate yourself with?Satanism?
Basically, Satanists stand alone. We take what we need from everyone else.
4. What other religion do you least associate yourself with?Hmmm...as hostile as I am towards Christianity, I find Islam to be much more problematic and regressive. Christian fervor seems to have economic limitations, whereas Muslims seem more likely to blindly murder strangers no matter how wealthy their families are. OK, I pick Islam.