Question:
Since an apostate cannot be saved (Hebrews 6:4-6), does that mean that if we hear the gospel and don’t receive Christ that He won’t try again?

Answer:
No, these people went along with Christianity for a while, but were never saved: then they turned away openly from Christ. But salvation is available now for all. “The blood of Jesus Christ His Son cleanseth us from all sin” (1 John 1:7). “Whosoever believeth in Him should not perish but have everlasting life” (John 3:16). If Christ has begun a work in us, He will complete it (Philippians 1:6). Every believer is “kept by the power of God” (1 Peter 1:5).