"All Muslim schools of thought use and justify their differing opinions by quoting hadith and Quraan, do you agree with all of them?"
No, I don't agree with all of them but rather choose the one that has a stronger opinion.
Whenever the Sahabah had a problem or a question, they would go consult whoever they found and trusted. Ibnul-Hammaam said “They would at one time ask one muftee and then at another time a different one, not clinging to any single muftee.†[al-Insaaf fee Bayaani Sababil-Ikhtilaaf (pg. 40) of Shaah Waliyyullah ad-Dihlawee]
"Why do I have to believe his opinion that a hadith can abrogate the Quraan?"
Am I asking you to believe in what he says?

"As you said if this guy's opinion is being a "salafi" is better than being a Muslim, why will I have to listen to his article"
Don't twist my words brother, I don't think anywhere in my post did I mention "being a 'salafi' better than being a 'Muslim" my correct sentence was "saying 'I'm a Salafi' better than SAYING (not "being") 'I'm a Muslim"!
"I over came that kind of idol worshipping"?
