Christ Jesus came to bring back to life that which died in the Garden (Genesis 2:15-17 and Genesis 3:1-19). Not only bring back to life, but to eternal life (John John 1:1-5;14 and John 3:16-17).
Before the Earth was formed, before the universe erupted into being from the holy lips of God, our wise Father gave us to the Son (John 17:1-3;24). Jesus has such an intimate relationship with the Father that only He truly knows His Father. He has revealed His Father to those whom He has chosen (Matthew 11:27).
Once we have been redeemed, our names written in the Lamb's Book of Life, we are sealed (Ephesians 1:11-13) for all eternity. Our life eternal is secure (Colossians 3:1-4). God does not change His mind, especially in matters as weighty as this (James 1:16-18). Our great God is faithful, regardless of our actions (Deuteronomy 32:1-4).
To say that there is anything you can do to lose this salvation is to assign a power to yourself even greater than God Most High (John 10:27-30). A salvation brought about, not only to keep His promise to Abraham (Genesis 12:3) and not only because He loves us, but for reasons that have nothing to do with us (Ezekiel 36:22-36), for the sake of His holy Name. To say that you can lose this is, in my opinion, blasphemous.
God is AWESOME