Both of the religions eschatology is well defined and graphically described. Heaven and Hell are regarded by Islam and Christianity as permanent adobes of the righteous and the evil doers ...

The first Heaven, for instance ... Either of these would mean that they had failed Allah’s test. Some Muslims believe that even the souls in Hell can eventually be sent to Paradise.

[It will be] the Day when no soul shall have power [to do] aught [ie anything] for another Heaven is described ... obeying the rules set by Allah is of ultimate importance. Hell is described ...