There has been billions of Christians Baptized. Its one of 7 sacraments in the Catholic church - the only Christian church for 1500 years.
Jesus also said, Unless you eat the flesh and drink the blood of the son of Man, you will not have life in you. Those who eat my flesh and drink my blood have ETERNAL life and I will raise them up on the last day. You can only get the body and blood of Christ from a priest who confects the Eucharist. All the Protestants are outside Salvation because of this one verse. Jesus said, Get away from me you wicked people, I never knew you.
Jesus also said, He who eats or drinks unworthily (not in the state of grace) brings Judgement upon himself. The precludes salvation for most Catholics.
We also are commanded to keep the Sabbath Holy. Usually that means attending Mass and not shopping on Sunday.
So that it, Baptism (2 billion), Eucharist (1 billion), Mass (25%), unworthily (1/1200 go to confession regularly)=0.0208% of people alive today. 2083 people. See why 144,000 is a high estimate for Salvation?