It is similar to a seller buying some cars for $10k each, and sell them on their dealership for $15k each. They can provide installment payment for the buyer and sell it for $20k each and they can pay it per month for $500. The difference between price is not loan/interest, its their profits.
Then I assume 2 would no longer be a risk? Bank owned the property, if you failed to pay bank will sold it to someone else who can pay, bank will then return your money if it sold higher than the set price.
Point is 3 is a weak contract issue, when you made the purchase, the contract should be clear that bank can not seize the house unless you failed to pay. If the contract says bank can cancel the transaction however they want or whenever they have issue, no one would want to do business with them. Imagine accepting a project but we put the terms, we can cancel the project and not return your money if we have issues with it.
Again 4 is also a contract issue, we have to draft the contract to make it feasible for both parties. It is basically an installment, you buy $100k house for $100/month. That’s it, the values are clear, the monthly payment will not go higher or lower, you can even pay the remaining directly with hard cash on the next month if you want.
A lot of states are working to outlaw these deals, because for these reasons and others they are considered abusive.
Best of luck!
Stay very, very far away from these types of loans is the best financial advice here.
And, come on man, really, is it that amazing that financial advice from 1500 years ago is a little bit out of date ? Yes, the Jewish and Roman empires experimented a lot with interest rules and had some very bad experiences doing that, especially in the provinces, so yes, they considered it evil at the time Islam was created. Great. They also considered straight lines evil for a thousand years (not joking about the straight lines) ... And while both pieces of advice have some validity to them, they should be reevaluated when practical.
Although this comes in many different flavors. And, of course, despite everything sounding nicer ("partnership"), it is in fact a much worse position for the buyer to be in.
An example of islamic finance "without interest": you want to buy a house, and repay your "non-loan" over 30 years. You put down a 10% downpayment.
The bank purchases the home, immediately increases the price by the full interest (let's simplify that calculation to 30yearly interest rate/2, so let's call it 50% for 30 years at 4%) then leases it back to you, and if you run out the lease they promise to transfer (for an additional fee) the ownership of the property to you. This is called a "partnership". This is illegal in most of the world, because it's exploitative. Why?