If you have bad credit and want to buy a house you should look around for a house that is being sold as rent to own and being sold by the owner of the property.
Sometimes you'll need to pay a down payment and other you may not need a down payment.
When you rent to own you pay rent to the landlord "the owner of the property" and then depending on the contract you signed you either have to come up with the rest of the money in a time period such as 5 years or so or you own the house once your last rent payment is made.
Meaning you made enough monthly rent payments to cover the cost of buying the house.
Rent to own contracts and deals differ from one home owner to another.