That Calvin is without fault in his writings and is not to be questioned.
Huh? Are you serious?
You're asking this in a Baptist forum! Every Calvinist here, if they are really Baptist, has major disagreements with Calvin's writings.
Most Calvinists haven't even read much of Calvin. They agree, in a general sort of way, with Calvin on soteriology. But then Calvinistic soteriology was held by many others before and after him.
Calvinism is just the most common label used to describe a particular take on salvation--that start to finish, it's a work of the Lord. The name has nothing to do with revering Calvin or his writings.
And of course calvinists are dogmatic on matters of salvation. It's an important subject, and they've studied the scriptures, and they believe what they see taught in scripture in regards to salvation is important.
Anyone who cares about the truth ought to be quick to stand up for what they see as truth, don't you think?