[pinkpanther]

These individuals argue that Jesus should not have to die for the sins of others, asserting that a merciful and just God would not require such a sacrifice....that everyone should be judge by their own actions.....

Let me show you one eg of a unmerciful and unfair God....
If you believe in Allah, then you have to submit to Muhammad and believe in his words...

Abu Musa' reported that Allah's Messenger (ﷺ) said:

When it will be the Day of Resurrection Allah would deliver to every Muslim a Jew or a Christian and say: That is your rescue from Hell-Fire.

https://sunnah.com/muslim/50/57-60