alam al arwah (a'lam e arwah) .. can some one please help me out?

I just got to know that souls were already created for every human being born/who will be born on earth, till judgement day.. I was arguing that souls don't exist and when we die we die, that's it, nothing more nothing less, just like how we did not exist before birth we'll never exist after death...

but then that scholar asked me to read about this topic.. n I need the flaws in this topic so that I can go talk to him.. I told him I didn't believe in life after death, or in heaven/hell concept etc..

long story short, I need help with the flaws of alam e arwah for a debate with a scholar,..