Romans 4-6
There are no works sufficient for reconciliation with God, as that is only available through faith. Paul points out that Abraham believed, and was counted as righteous (Genesis 15:6) before he was circumcised, proving that faith alone is important, and not works of the flesh, or being a circumcised descendant of Abraham.
God demonstrated His love for us, in that while we were still sinners Christ came and died for all. Sin is forgiven in the blood of His sacrifice, and we are raised to eternal life with Him. The disobedience of one man, Adam, introduced sin and death into the whole world. The obedience of one Man, Jesus, annulled original sin, making it possible for every person to escape the curse of death in Him.
We are expected to sin less after being saved. We have been baptized (or buried) into His death, and we have likewise been raised from the dead with Him to eternal life, so we shouldn’t let sin have control of us any longer.
Everyone is given a choice - receive eternal condemnation for sin in our own unrighteousness, or accept the free gift of eternal life in the righteousness of Jesus Christ.