YDAKH, I totaly agree with you quran is not the only shariah, its the foundations. The Shariah can not be formed with out koran and sunnat, and also schools of thought etc.
About dead people, its true, people dont die, they live another life until the day of judgement which is called Barzakh. I think thats only for people who are not being punished in their graves, you should read about it, it is very interesting. and scary, when i read about life after death and what happens when we die etc. its what made me more religious and god fearing allhamdulillah. Giving salaam, to sufis is fine, but asking of them is wrong, if you have read the topic i posted on shirk you will understand.