They reject it because they have not been made alive (according to your doctrine) and they do not have the ability because God refused to make them alive. Therefore the offer is not genuine.
The Command is to Repent and Believe the Gospel.
And to bring forth fruit meet for repentance.
Or, die in their sins, where all human beings are found, as lawbreakers, dead in trespasses and sins.
You has He "QUICKENED" who were dead.
There is no, "offer" of a "gift".
There is a COMMAND to REPENT.
If one understands that it is God Who QUICKENS and MAKES ALIVE a Spiritually dead
soul, with The Adamic Nature, then, AND ONLY THEN, can they Spiritually discern How God Saves a soul, ACCORDING to ALL SCRIPTURES in The BIBLE and NOT how a Spiritually dead sinner QUICKENS THEMSELVES from THE DEAD.
That has never taken place in the history of mankind.
That is another Gospel that instructs lost souls to remain in their sins.
"Here is the "offer" of a "gift" to "not go to hell", do you want it?
Yes, but the lost individual is still lost and deceived by a false preacher to "belief" a false gospel, NOT FOUND in Scripture.
Jesus is the Savior and Deserves to be WORSHIPPED SO, and is, by some.