You are capable of sinning and losing your salvation. It's all over the New Testament. Saying backsliders were never saved to begin with is circular logic.
>Confession:
John 20:21-23 "Whoever's sins you forgive are forgiven, and whoever's sins you retain are retained"
James 5:16 "Therefore, confess your sins to one another and pray for one another, that you may be healed. The fervent prayer of a righteous person is very powerful."
>Eucharistic
John 6: 51-58
I am the living bread that came down from heaven; whoever eats this bread will live forever; and the bread that I will give is my flesh for the life of the world.”a
The Jews quarreled among themselves, saying, “How can this man give us [his] flesh to eat?”
Jesus said to them, “Amen, amen, I say to you, unless you eat the flesh of the Son of Man and drink his blood, you do not have life within you.
Whoever eats* my flesh and drinks my blood has eternal life, and I will raise him on the last day.
For my flesh is true food, and my blood is true drink.
Whoever eats my flesh and drinks my blood remains in me and I in him.
Just as the living Father sent me and I have life because of the Father, so also the one who feeds on me will have life because of me. This is the bread that came down from heaven. Unlike your ancestors who ate and still died, whoever eats this bread will live forever.”
Jesus didn't stop anyone and say he was only speaking metaphorically.
1 Cor. 11: 23-29 "For I received from the Lord what I also handed on to you,to that the Lord Jesus, on the night he was handed over, took bread,
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and, after he had given thanks, broke it and said, “This is my body that is for you. Do this in remembrance of me.”
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In the same way also the cup, after supper, saying, “This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me.”l
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For as often as you eat this bread and drink the cup, you proclaim the death of the Lord until he comes.