The Holy Bible says,

Whoever believes in him (Jesus Christ) is not condemned,

but whoever does not believe stands condemned already

because he has not believed in the name of God's one and only Son (Jesus Christ).

(John 3:18).

The wages of sin is death. The only way to atone sin was through the ritual of sacrifice. Then Jesus came. He is the way, the truth and the life. Jesus became the atonement for sin, all sin. No more do we atone for sin through sacrifice because Jesus became the sacrifice for all. So to answer your question... If a person does not acknowledge Jesus as King of kings, Lord of lords, the Son of God, they have rejected Him and say His teachings are false. That rejection will be punished. The punishment is eternal separation from God. We know it as hell. Before those who rejected Jesus are banished from God's presence it is written that ALL will bend their knee and acknowledge Jesus as King, but it will be too late for those who rejected Him.

I wish it was different but it is not.

Chist don't came to save us, but to show us what's the best way to find God.

Nobody will be saved by grace, but by their belief and attitudes. Mostly for the love
and respect to the next.
We are all children of God, apart from accepting Jesus or not.
It is time to think as God's children, regardless of religion.
God's alone rests the right to judge, but his greatness he did not do
it.
Before putting the house next door, we need to be with us in peace.
Love, Respect, fraternity, solidarity, equality and freedom ... these are the maxims
of God.
Believe me I'm with God and will always be with him, even without believing that Jesus
was his only son and our savior.