The word says that Jesus became the author of salvation for all those who obey Him. (Heb. 5:9) It is through obedience to His word that one's true faith/belief in Jesus is revealed. Without exception all those living since the Holy Spirit was poured out are required to repent, be water baptized in the name of Jesus for remission of sin, and receive the Holy Ghost. (Luke 24:47, Acts 2:4-41, 8:12-18, 9:17-18, 10:43-48, 19:1-7, 22:16)
"Therefore let all the house of Israel know assuredly, that God hath made the same Jesus, whom ye have crucified, both Lord and Christ.
Now when they heard this, they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do?
Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call.
And with many other words did he testify and exhort, saying, Save yourselves from this untoward generation.
Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls. And they continued stedfastly in the apostles' doctrine..." Acts 2:36-42