Just to be clear, does the concept of redemption doesn't exist in FR?
In the D&D multiverse gods exist but they are not omnipotent/omniscent. They are "just" superpowerful beings with sway over the souls of their dedicated followers after they die.
In D&D the whole universe is ballanced on the moral axis of Good vs Evil, Law vs Chaos and neutrality in between.
This means Neutral Good deities are usually big about forgiveness. Lawful Good deities could contemplate forgiveness but only after strenuous process of repentance and penance as defined by the law. Chaotic Good deities would forgive misdeeds or not depending on their personal choices/ideology (Chaotic Good is mostly about fighting istitutionalized evil without a great commitment to a code of laws, tradition and so on). Lawful Neutral deities would stress the importance of following the letter of the law while true Neutral deities would try to judge deeds without prejudice or moral inclinations of any kind. Chaotic Neutral deities just don't care. Lawful Evil gods are big on punishment, possibly capital, for very minor infractions unless the law gives you a way out (pay a huge fee only the rich could afford). Neutral Evil deities judge you based on what profits them the most and ignore/change the law as it suits them. Chaotic Evil deities just don't care they will torture/kill or make use of you based on a whim.
Edit: to answer your question more clearly. In D&D redemption depends on what deity you follow and how you position yourself on the cosmic moral axis that determines how the universe works. Being "redeemed" as a Sharran is way different from redeeming yourself as a follower of Selune for example.
