Many can and do blindly parrot Calvin or Benny Hinn or any of dozens of Church teachings. No difference here, blind parrots come in many colors.
Agreed. And everyone is accountable for their own beliefs - even more so when you have the Word of God so freely available. I don't agree with everything that John Calvin, Martin Luther, or even my own church teaches. Yes there are differences. But on the essentials, most Protestants are unified. Salvation by grace through faith in Christ alone. The trinity. The virgin birth. These kind of basics which are found in Scripture. We may disagree on tongues, or mode of baptism, or even on the efficacy of Communion (which I know you would consider an essential - but we are discussing Protestant unity), but on essentials that make the difference between "saved" and "not saved." We are unified. It doesn't matter to your salvation if you believe you were elected or not. That is a secondary issue. It does matter what you believe about Christ and Him crucified.