You can't redirect Into The Maw of Hell to a player.
Redirect allows you to choose new legal targets for a spell. As such, you must choose one valid target land and one valid target creature for Into The Maw of Hell to (newly) target. If (for instance) there is only one creature in play - yours - you could Redirect Into The Maw of Hell such that it destroyed a different land, but you would still have to keep it targeting your creature, because there are no other available legal choices.
The relevant section of the Comprehensive Rules (and the most relevant paragraph highlighted by me):
114.6. Some effects allow a player to change the target(s) of a spell or ability, and other effects allow a player to choose new targets for
a spell or ability.
114.6a If an effect allows a player to "change the target(s)" of a spell or ability, each target can be changed only to another legal
target. If a target can't be changed to another legal target, the
original target is unchanged, even if the original target is itself
illegal by then. If all the targets aren't changed to other legal
targets, none of them are changed.
114.6b If an effect allows a player to "change a target" of a spell or ability, the process described in rule 114.6a is followed, except that
only one of those targets may be changed (rather than all of them or
none of them).
114.6c If an effect allows a player to "change any targets" of a spell or ability, the process described in rule 114.6a is followed, except
that any number of those targets may be changed (rather than all of
them or none of them).
114.6d If an effect allows a player to "choose new targets" for a spell or ability, the player may leave any number of the targets
unchanged, even if those targets would be illegal. If the player
chooses to change some or all of the targets, the new targets must be
legal and must not cause any unchanged targets to become illegal.
114.6e When changing targets or choosing new targets for a spell or ability, only the final set of targets is evaluated to determine
whether the change is legal. Example: Arc Trail is a sorcery that
reads "Arc Trail deals 2 damage to target creature or player and 1
damage to another target creature or player." The current targets of
Arc Trail are Runeclaw Bear and Llanowar Elves, in that order. You
cast Redirect, an instant that reads "You may choose new targets for
target spell," targeting Arc Trail. You can change the first target to
Llanowar Elves and change the second target to Runeclaw Bear.