We DID receive His forgiveness and mercy: about 2000 years ago.
"By the which will we ARE sanctified through the offering of the body of Jesus Christ ONCE FOR ALL..But this man, after he had offered ONE SACRIFICE FOR SINS FOREVER, sat down on the right hand of God..for by ONE OFFERING he hath perfected FOREVER them that are sanctified." Heb. 10:10,12,14.
There is no other offering to be made for forgiveness and mercy. Even thought the RCC has Him dying every day, all day long, around the world, the Bible says He died ONCE for ALL SINS, FOREVER. He will not die again, no matter what the RCC teaches/believes/performs.
We can either accept that ONE TIME OFFER, or try to perform works of righteousness (keeping the law) for our salvation. But the Bible says that by the works of the law will NO man be justified.
As for the fallen people born into the original sin of Adam, read Romans 5.
"For if by one man's offence death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ." ROm. 5:17. WE are a new creature, created in Christ.
"Therefore being justified by faith, we have peace with God THROUGH OUR LORD JESUS CHRIST:" ROm. 5:1.
We who are saved through the finished work of Christ have PEACE with God through Christ. We do not need constant forgiveness. We have been forgiven; by the Cross. We do not need constant mercy: God's mercy was poured out on us by the Cross.
I think this is what RCs and others who are so afraid to step out in faith that everything needed to secure their salvation was taken care of 2000 years ago, at the Cross, are not willing to believe:
"What then? shall we sin, because we are NOT UNDER THE LAW, but UNDER GRACE? God forbid.
Know ye not, that to whom ye yield yourselves servants to obey, his servants ye are to whom ye obey; whether of sin unto death, or of obedience unto righteousness?" Rom. 6:15,16.
Do you understand what this means? You can yield yourself as a servant to obey the law, which brings sin unto death. Or you can yield yourself as a servant to the obedience of GOd's Grace, which brings righteousness.
He said to him, What is written in the Law? How do you read it?"
And he answered, "You shall love the Lord your God with all your heart and with all your soul and with all your strength and with all your mind, and your neighbor as yourself."
And he said to him, "You have answered correctly; do this, and you will live."
But he, desiring to justify himself, said to Jesus, "And who is my neighbor?"
Jesus replied, "A man was going down from Jerusalem to Jericho, and he fell among robbers, who stripped him and beat him and departed,
leaving him half dead. Now by chance a priest was going down that road, and when he saw him he passed by on the other side. So likewise
a Levite, when he came to the place and saw him, passed by on the other side. But a Samaritan, as he journeyed, came to where he was,
and when he saw him, he had compassion. He went to him and bound up his wounds, pouring on oil and wine. Then he set him on his own animal
and brought him to an inn and took care of him. And the next day he took out two denarii and gave them to the innkeeper,
saying, 'Take care of him, and whatever more you spend, I will repay you when I come back.' Which of these three, do you think,
proved to be a neighbor to the man who fell among the robbers?"
He said, "The one who showed him mercy." And Jesus said to him, "You go, and DO likewise." ... Luke 10: 25-37
"Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them. ... Matthew 5:17
Oh ...Still Small Voice, this is most certainly not an 'either/or', Christ says that WE CAN DO BOTH!!!