the way "islamic banking" was envisioned, they created a problem then suggested an alternative which is the same thing, just with arabic names.
there is something called "shariah compliant banking" but "islamic banking" on its own is a misnomer and doesn't exist.
don't believe me, here is a video of Dr. Mohammad Shahrour on the subject.
https://www.youtube.com/watch?v=dEk_8-jaSUs
its really short but brings home the idea.
your next question might be "so...whats islamic banking then". the answer is simple. when you can't fight in a free market so what you do is change the market so that customers automatically opt for your "superior" product as opposed to the competition.
You can read up on this by finding "why need for islamic banking" arose. the problem didn't exist till then so someone just literally invented it and then sold a solution