Everyone's already on low interest loans. The whole country enjoys very low interest due various federal programs and institutions. If it weren't for the government, you would be looking at 25%-35% APR on a car loan with good credit.
"Sharia lending" is a modern construct to enable Muslims to participate in the modern, credit-dominated economy, and the effective interest rates end up being not much different than you get with conventional banking. It can't exist without the Federal Reserve and Treasury bonds.
The fundamental problem is the average person believes that everyone should get credit. Thus we have a variety of government interventions to give these people access to credit. However, the reason certain people (mainly niggers) shouldn't get credit is they're irresponsible retards. Nothing the government does can actually cure this. If we had a laissez-faire credit market, nobody would lend to niggers, and bleeding heart voters (mainly women) would feel bad for them and demand somebody fix this monstrous injustice.