In the New Testament we read in each gospel the story of the great commission where disciples are told to preach the gospel to the lost.
In the book of acts we read again and again of disciples preaching the gospel to the lost. We see them preaching to the Jews at Pentecost.
New American Standard Bible
37 Now when they heard this, they were pierced to the heart, and said to Peter and the rest of the apostles, “Brothers, what are we to do?” 38 Peter said to them, Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit. 39 For the promise is for you and your children and for all who are far away, as many as the Lord our God will call to Himself.” 40 And with many other words he solemnly testified and kept on urging them, saying, “Be saved from this perverse generation!” 41 So then, those who had received his word were baptized; and that day there were added about three thousand souls.
We read of the gospel being shared with the Samaritans by the evangelist , not the apostle, Philip.
New American Standard Bible
14 Now when the apostles in Jerusalem heard that Samaria had received the word of God, they sent them Peter and John, 15 who came down and prayed for them that they would receive the Holy Spirit.
In acts 10 we read about the gospel coming to the gentiles and Cornelius and his household was baptized into Christ.
The epistles are all being sent to churches to continue teaching the disciples there about a Christ.
In my experience the majority of people I meet who struggle greatly with their faith all the time tend to be people not involved with their local congregations and they try to replace that with online chitchat. They also often don’t preach the gospel to the lost. Many often have friends who don’t even know they are disciples. In scripture you don’t read of lone Wolf Christians not in fellowship with their local disciples and you don’t read of disciples who are covered lamps keeping their faith to themselves.
These are rhetorical and don’t need to be answered here but something that should be reflected on.
When is the last time someone called you to pray for them?
When is the last time you prayed for someone?
When is the last time you preached the gospel to a complete stranger and tell them about Jesus and invite them to study the Bible with you and go to church?
Who is the three people that you know you can call at 5am in the morning to meet you and study the word with someone? Whose the disciples that head out into the world with you and preach.
If you are already a disciple, and you’re struggling with your faith I think often if you consider these things and start practicing your faith beyond reading books and sometimes fellowshipping in person you may see your faith beginning to grow.
We are told to seek out the kingdom.