One, actually while Calvinism states that Adam had 'free will' in point of fact no one has it since it is God who, through His directive will(eternal decree) decreed that Adam sin! Remember Calvinists do not accept the idea of a 'permissive will', the view that God would allow that which He does not want.
Two, no one questions we are 'dead in our sins' the question is can one respond to the free offer of Grace, if it is God who provides the Light (2Cor.4:6).Remember God did seek out Adam even though Adam hid.
Thanks for the post.