No its not. Our salvation is based on righteousness. If you receive the Lord by faith, call on His name, you shall be saved. Doesn't matter if God hates you and you are the least merciful person on the planet. It is a matter of righteousness and God's word.
Mercy on the other hand is different. If I am judged by the letter of the law at the Lord's judgment seat it will be incredibly uncomfortable. It will come across as petty, and anal. Yet, if that is how I have treated others it will be a righteous judgement. Doesn't mean I won't be saved, only that I will not get out of that judgment till I have paid the very last penny. On the other hand if I have been extremely merciful in my life, showing mercy to many, many people who have wronged me whether slight wrongs or even great wrongs, then I may find the judgement at the Lord's throne very merciful with many of my failings being given a pass.