Christians do not lose Christ. Roman Catholics might...but Christians don't.
1 Corinthians 9:27 but I punish my body and enslave it, so that after proclaiming to others I myself should not be disqualified.
2 Timothy 2:12 if we endure, we will also reign with him; if we deny him, he will also deny us;
Philippians 2:12 Therefore, my beloved, just as you have always obeyed me, not only in my presence, but much more now in my absence, work out your own salvation with fear and trembling; 13 for it is God who is at work in you, enabling you both to will and to work for his good pleasure.
I do not think it is by chance that the only verse in the whole Bible with the number 666 is when many disciples refused Christ’s teaching about the Eucharist and they went away!!! John 6:66!
Best wishes, when the the Abomination of Desolation happens and all those Christians who have not accepted or are ignorant or have refused Christ’s teaching about the Eucharist, will not even know why things will precipitate to the worse more quickly than we can imagine.
What's restraining evil is the Holy Spirit and His presence in us.
1 Corinthians 3:16-17 Do you not know that you are God's temple and that God's Spirit dwells in you? If anyone destroys God's temple, God will destroy him. For God's temple is holy and you are that temple.
1 Corinthians 6:19-20 Or do you not know that your body is a temple of the Holy Spirit within you, whom you have from God? You are not your own, for you were bought with a price. So glorify God in your body.