Did you know that the promise of the Gospel is rejected or denied by over half of professing Christianity? God’s promise is eternal, everlasting, never-ending life with the Lord Jesus Christ that is backed up by His awesome power (1 Pet. 1:3-5). Below are 14 questions to ask professing Christians who believe they can lose their salvation. 
How can one, who has been born again of incorruptible seed, die again? (1 Pet. 1:23).
How can a new creation return to what he was? (2 Cor. 5:17).
How can one who has been perfected forever be found imperfect? (Heb. 10:14).
How can those God justified not be glorified? (Rom. 8:29-30)
How can any man undo a sovereign act of God? (John 1:12-13).
How can one who have been redeemed from the curse of the law be placed back under the curse? (Gal. 3:13; 4:5).
How can God’s irrevocable gift of eternal life be revoked (Rom. 11:29)
How can the Good Shepherd who gave His life for His sheep fail to protect and keep them from falling? (John 10:1-30; Jude 24)
How can the perpetual intercession of Jesus to keep His people be denied? (Heb. 7:25)
How can the proof of God’s unconditional love be conditional? (Rom. 8:31-39) 
How can those God delivered from the power of darkness be sent back? (Col. 1:13).
How can those made complete in Christ become incomplete? (Col. 2:10).
How can those who were justified without human effort or merit be condemned because of demerits? (Eph. 2:8-9).
How can God, who cannot lie, break His promise? (Titus 1:2).