Can Christians Enter Heaven Without being Holy?

Holy = Of God and therefore regarded with reverence, associated with God, consecrated, devoted to the service of God.
Hebrew: qudosh = an object set apart.
Greek: hagios = separate, set apart.
“Follow peace with all [men], and holiness, without which no man shall see the Lord.” Heb 12:14
“Ye are witnesses, and God also, how holily and justly [...]