How are such things measured?
We sin in ways we aren't even aware of.
We, (by an act of our own free-will), cannot undo what only God can do in the first place. IMHO
Maybe accepting grace is not exclusive to Christian. The Jews scattered in 70AD would really be lost without grace:
M't:5:3-11:
Blessed are the poor in spirit:
for theirs is the kingdom of heaven.
Blessed are they that mourn:
for they shall be comforted.
Blessed are the meek:
for they shall inherit the earth.
Blessed are they which do hunger and thirst after righteousness:
for they shall be filled.
Blessed are the merciful:
for they shall obtain mercy.
Blessed are the pure in heart:
for they shall see God.
Blessed are the peacemakers:
for they shall be called the children of God.
Blessed are they which are persecuted for righteousness' sake:
for theirs is the kingdom of heaven.
Blessed are ye, when men shall revile you,
and persecute you,
and shall say all manner of evil against you falsely,
for my sake.
M't:11:6:
And blessed is he,
whosoever shall not be offended in me.
Eze:36:16-23:
Moreover the word of the LORD came unto me,
saying,
Son of man,
when the house of Israel dwelt in their own land,
they defiled it by their own way and by their doings:
their way was before me as the uncleanness of a removed woman.
Wherefore I poured my fury upon them for the blood that they had shed upon the land,
and for their idols wherewith they had polluted it:
And I scattered them among the heathen,
and they were dispersed through the countries:
according to their way and according to their doings I judged them.
And when they entered unto the heathen,
whither they went,
they profaned my holy name,
when they said to them,
These are the people of the LORD,
and are gone forth out of his land.
But I had pity for mine holy name,
which the house of Israel had profaned among the heathen,
whither they went.
Therefore say unto the house of Israel,
Thus saith the Lord GOD;
I do not this for your sakes,
O house of Israel,
but for mine holy name's sake,
which ye have profaned among the heathen,
whither ye went.
And I will sanctify my great name,
which was profaned among the heathen,
which ye have profaned in the midst of them;
and the heathen shall know that I am the LORD,
saith the Lord GOD,
when I shall be sanctified in you before their eyes.