I would like to clarify that, strictly speaking, I am not proposing “Grace in the absence of sin” but rather the following:
When God made the first Homo sapiens creatures into humans in the image of God, he endowed these with original grace so as to they were not submitted to illness, death, and concupiscence.
These deficiencies (encoded in the sapiens genome and transmitted biologically by DNA replication) originate from the state of frustration and decay to which God submitted the creation from the very beginning.
And God created the world in such a state because it is theologically convenient in case sin happens, i.e.: to facilitate that the sinners convert and return to God’s love.
So, according to my theological-biological explanation also the original grace is “Grace to overcome the consequences of sin” after all.