It is possible for man to live there, but not on some terraformed ball.
Mars has more than enough resources to construct massive enclosed spaces that are also partially underground, and more than enough water to people ,plants and animals to live.
They wont have oil or petroleum, but there might be lots of natural gas. Also nuclear power is a given, as well as solar beamed to the ground via microwaves, maybe some wind power.
It will be a constant challenge to keep it going as everything will depend on man, though.
Newest idea about Ceres is a small rocky core and an ice capped ocean 150 miles deep? Lots of water if true.