In human relationships one person sins against another person. Sometimes the person sinned against forgives the person who sinned against them (sic). Whether or not the person who sinned believes it or accepts the forgiveness has nothing to do with the fact that they have been forgiven by the person they sinned against. The person who sinned had no part in the other person forgiving them. The forgiveness came from the heart of the person who was sinned against. [False analogy]
We sinned against God. The whole human race sinned against God. God says to the whole world, in Christ, [false, "in Christ" only means believers] because His atoning sacrifice for your sin, I forgive you. [<--Incoherent sentence] You may not believe it or accept it but that doesn’t change what God has determined in His heart. [JP Meyer's Decision Theology]
That does not mean that the whole human race is saved and will be heaven. Only those who put their personal trust in God’s forgiveness will be saved. Those who reject it will have to pay for their own sins in the torments of hell for all eternity.
That is what Jesus accomplished by His life, death and resurrection. We sinned against God and He says to us, to all people, to the whole world, I forgive you in Christ. Confess you (sic) sin and believe it, trust in it and “Behold the Lamb of God who takes away the sins of the world” (John 1:29). [John 1:29 does not teach UOJ.]