Imperishable Inheritance

There is such an emphasis in modern churches on the quantity of converts over quality; and they attribute this success to the work of the preacher, music, church, or anything besides the Holy Spirit. What does it mean that over 2 billion people in this world are professing Christians? Nothing.

"Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of heaven, but the one who does the will of my Father who is in heaven. On that day many will say to me, 'Lord, Lord, did we not prophesy in your name, and cast out demons in your name, and do many mighty works in your name?' And then will I declare to them, 'I never knew you; depart from me, you workers of lawlessness.'
Matthew 7:21-23

This verse speaks specifically against those who go down during an alter call, sign a 'salvation contract' with God, and believe they're saved and go back to their sinful lives. Jesus, by worldy measures, wasn't that sucessful:

In fact, if we were to look only at numbers, we might be tempted to conclude that Jesus Himself was not an especially gifted evangelist. He started His ministry with a multitude of followers, but ended with only eleven faithful disciples. He often spoke words that offended His hearers (John 6:41-56; 8:31-59), which eventually provoked many of them to abandon Him (John 6:60-66). His discipleship demands were also hard (Matthew 10:34-39; 16:24-26; 19:21; Luke 9:57-62). Nevertheless, everything He said and did was in complete accord with the Father's purpose. Thus, we should never conclude that a large, positive response to the Gospel message, by itself, proves that God is blessing our methods or that such a response is genuine (John 2:23-25). Instead, we must faithfully declare the whole counsel of God (Acts 5:20; 20:27) and leave the results to Him, who alone is able to add to the church (Acts 2:47; 13:48; 1 Corinthians 3:6-7; Psalm 127:1).¹

Modern churches simply have to much of a focus on man-centered theologies then that of God. We are here to serve and worship God, not the other way around.

Exalt the LORD our God; worship at his footstool! Holy is he!
Psalms 99:5

So, how do we know we're saved?

Lordship Salvation.