It is incumbent on each Christian to proclaim the gospel of forgiveness of sins and salvation in Jesus so that others might believe and be saved. As the Creator of the universe, God has the sovereign right to set the standards he wants to set. We recognize this in human affairs. If I have made pottery, I can use that pottery for whatever purpose I want. Law schools in our country set entrance standards that many people will never be able to meet.
Schools have that right.
The army sets standards for admission into the Special Forces, standards that 97 out of 100 people tested will fail. No one questions these standards. He created us. Sinful human beings will always accuse God of being unfair or arbitrary until they come to a full realization of their sins and the punishment they deserve, and a full understanding of God's mercy and grace in sacrificing Jesus so that we might be saved. Rather than accusing God of being self-centered and egotistical, when we understand his plan of salvation we will marvel at his wisdom and love.