I've gotten through the God of War's door, but I can't reach his temple.

The jaws that are to the left and right of the entrance are the key to
opening the first door that you will encounter.  (Note that left and right
mean the directions that were left and right when you first got through the
doorway to this area.)

When you open the one on the left, the door will open, and opening the one on
the right will stop the spears that are flying across the doorway.

You'll need to get both of the jaws to stay open to get through the door.

Put something in them that might be found as the result of war (and death).

You can get two skulls from skeletons underneath the temple -- one was
immediately in front of you as you entered the tunnels, and the other is just
below the right-hand set of jaws.

Put both skulls in the jaws before they close, and you can move in a bit
further.

You still have to get past the second set of spears.

The left of the two jaws further down the hallway will stop the spears.

But to stop the spears permanently, you're going to have to find a way of
keeping the jaw open a bit longer.

The answer here is really just a bit of juggling.

You'll have to take one of the two skulls out from the entrance.

Take the left skull at the entrance, and if you're quick enough, you can run
through the door before it closes.  Don't worry; you'll be able to open the
door later.

Now, you can get past the second set of spears.  You'll find another skull at
the end of this hallway, which you can put in the right jaws -- and open the
door back out to the entrance.

What you need to do now is find the set of jaws that, when held open, will
let you get through the door at the very end of the hallway.

The left jaws at the entrance will do that.

You're going to have to take a skull out of one of the jaws, though.

You can temporarily spare the one stopping the second set of spears (the left
jaws in the second set).  Take that skull, and move it to the left jaws at
the entrance.