On day of judgement if you have backbitten someone your good deeds will given to that person or if you don't have good deeds you will take his evil deeds. We all know everyone backbite, it's difficult to be free from it or any other sins. Also there is no guarantee if you have a lot of good deeds you will enter Jannah so is there any point of doing good deeds? I am not telling anyone to stop doing good deeds, just asking a question to increase my knowledge.
Purpose of doing good deeds
Perform the prayer at the borders of the day, and during the approaches of the night. The good deeds take away the bad deeds. This is a reminder for those who remember.
And be patient. God will not waste the reward of the virtuous.
Whoever strives, strives only for himself. God is Independent of the beings.
Those who believe and do righteous deeds—We will remit their sins, and We will reward them according to the best of what they used to do.
Bad deeds may be erased
- This is the ordinance of God, which He sent down to you. Whoever fears God—He will remit his sins, and will amplify his reward.
Brother, doing good deeds is very important because it may erase bad deeds, and increase your position in jannah, in shaa Allah. You'll (likely) regret the moment you missed the chance to do a good deed, because those will very likely change your life ETERNALLY. Know what's light on the tongue, yet heavy on the scale on the Day of the Judgment? Dhikr, and the best Dhikr is the Holy Quran.
And Allah knows best.