Why would we think that, unchained from sin nature, there is no other choice but to accept God?  Adam and Eve did not have a sin nature, but they still freely rejected God.  If Christ's redemption redeems and elevates our nature by union with Christ, then would not that raise us to the freedom to love God as Jesus loves God the Father?  It would seem to me that, for this love to be freely given, the possibility must exist that this love may be freely refused, as well.