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Pathfinder is not the easiest RPG to learn. Generally, it takes at least 3 hours to fully create a level 1 character, with the assistance of a DM.
Concerning the game, here we are in an RPG, not a computer game where characters are virtually immortal. Character do die.
It is a harsh way to start indeed, but if your DM gave good reasons why it happened it might be something to learn.
But your DM seems (at the best) to be a fan of "Learning from failure" method... which is not the best one, especially with beginners.
And it is quite difficult for a bunch of warriors to avoid traps...