I wouldn't say that. IMO, to deny the sovereignty of God over our lives is far worst then to deny the free will of man. One has scriptural support.
This topic has been discussed at nauseum here of FR
That is very true. That is simply because from this error springs a host of other errors.
Catholicism does not deny God's sovereignty
Calvin, and seemingly your idea of God's sovereignty is within man's concept of time, while the correct sovereignty of God is God knowing everything in one NOW-all at once.
Calvin made the grave mistake of not understanding God is beyond our concept of time and applied everything to his heretical beliefs of denial of free will- in doing so he applied human concept of time to God