Is a "halal certificate on some financial instruments" a relevant thing outside of Sharia law? This is a serious question. Are more moderate Muslims okay with interest, or is it pretty much across the board? I'm sure you can find some of any group okay with just about anything, I just mean in general. I'm not sure where on the spectrum of atheist to Islamist something like this falls.

Right or wrong I have always associated refusal to use traditional banking a more hard-line Muslim belief.