In Revelations it explains that the 144000 are 12000 from each of 12 tribes, who have never slept with a woman, virgins...Israelites, it has nothing to do with how many people are saved or will be saved.
the number 144,000 is not a literal number, but one in which represents
12 ( OT tribes )
times 12 ( NT Apostles )
times 1,000 ( represents the completeness of God’s plan )
equals 144,000