Where did you get that idea?
All of mankind is created in God's image and likeness.
No one is exempt from the calling to be like God.
The most important attribute of God toward mankind is His mercy because all of mankind has sinned and the only hope of alll mankind is His mercy.
Those who strive to be like God by being merciful (loving one's neighbor) inherit the kingdom.
Those who do not strive to be like God go to hell.
That's what Jesus told ALL MANKIND (not just a select few) at Mat 25:31-46.
There is not one standard for the people you deem to be "His servants" and another for those whom you deem are not "His servants."
Has nothing to do with discussion, but is a dodge to the question.
By claiming the unfaithful servant is an unbeliever, you are teaching that unbelievers have been given the responsibility to serve His people, which are His servants.
Likewise this servant who became unfaithful started out as faithful because he was made "ruler" of His household.
JLB