If you truly selflessly love others, then you are already forgiven by God for all sins.
True selfless love of others always includes, at least implicitly, a rejection of all that is known by conscience to be gravely immoral. True selfless love of neighbor always includes, at least implicitly, what Catholics call perfect contrition (repentance from sin motivated by love).
Everyone who loves others goes to Heaven (perhaps after a temporary stay in Purgatory). People who are completely selfish or who truly maliciously hate others go to Hell. Anyone who knowingly commits a grave sin, and does not repent, certainly does not love others. For love and grave sin are incompatible. But everyone who truly loves others is repentant from any grave sins they may have committed. For love implies a rejection of all that is seriously wrong.
God judges everyone based on their own conscience.
To be forgiven, you must have true repentance: regret the things that you have done wrong in life, especially the most serious wrongs, and resolve to love others selflessly. Everyone who loves others is forgiven for every sin.
Then, going forward, strive to be a better person, to love others, and to follow your own conscience.
There is no sin whatsoever in this life that cannot be forgiven by God.
The only “unforgiveable” sin is to die without repenting from grave sins against your own conscience, things that you yourself knew at the time were very wrong.
For Catholic Christians and Orthodox Christians, there is a moral and religious obligation to go to Confession, if you have committed any grave sin. But if you are unrepentant, you are not forgiven.
Protestant Christians, Jews, Muslims, and other believers are forgiven, as long as they truly regret their sins and choose to love others selflessly. If anyone does not truly love others, then he does not love God.
Atheists, agnostics, and others who do not believe in God or who are unsure about God, can still be forgiven in the same way. They must regret their sins and choose to love others selflessly. Everyone who truly loves others, implicitly loves God (even those who do not believe in God).
Love is the path to forgiveness and to Heaven.
For love covers a multitude of sins. (1 Peter 4:8)
Because of this, I tell you: many sins are forgiven her, because she has loved much. But he who is forgiven less, loves less.” Then he said to her, “Your sins are forgiven you.” (Luke 7:47-48).
Whoever loves his brother abides in the light, and there is no cause of offense in him. (1 John 2:10).
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