God gives us the grace of initial salvation.
However - the Scriptures are adamantly clear that this salvation can be lost:
****Rom. 11:22, ******Heb. 10:26-27, ****2 Peter 2:20-22, ****Matt. 7:21, ****1 Cor. 9:27, ****1 Cor. 4:4, ****Matt. 24:13, ****Matt. 7:19-23, ****Rev. 3:5, **Rev.n 22:19
1 Cor. 3:9 tells us that as co-workers (Sunergos) with God, we cooperate with his grace - plain and simple. Simply believing in Christ makes you no better than the demons who also believe James 2:19. We MUST cooperate with God in order to be saved and Jesus was CLEAR on that:
Being baptized (Matt. 28:19-20, John 3:5, Rom. 2:29, Col. 2:12-17, 1 Peter 3:21)
Picking up our cross daily to follow him (Matt. 16:24, Luke 9:23)
**Works **of mercy and charity (Matt. 19:21, 25:31–46, Luke 18:22)
Obeying his commandments (John 15:10)
Doing the will of the Father (Matt. 7:21)
Dying and being buried with him through Baptism (Rom. 6:1-11)
We must suffer with Christ (Matt. 10:38, 16:24, Mark 8:34, John 12:24, Rom. 8:17, 2 Cor. 1:5-7, Eph. 3:13, Phil. 1:29, 2 Tim. 1:8, 1 Peter 2:19-21, 4:1-2)
Wow, you really are a “hard core Catholic”
Let’s take a look at some of those proof-texts you pulled out.
You say: “the Scriptures are adamantly clear that this salvation can be lost:”
Rom. 11:22, This verse is better understood in context (vv 16-24) and in no way declares individual salvation can be lost. The same God who cuts off a branch is able to graft it back into the tree. Simply stating God can do something doesn’t mean He will do it.
Heb. 10:26-27, Again, context is everything. And I noticed you ignored the word “if” in verse 26. I noticed in verse 39 the author doesn’t use the word “if” but instead makes a declarative statement: “But we are not those who draw back and are destroyed, but those who have faith and obtain life.”
2 Peter 2:20-22, could it be? Once again, CONTEXT reveals the truth! I’d recommend reading the entire chapter and not just a couple of verses. The chapter is dealing with false teachers. Obviously, false teachers are not saved and never were. They gained a little knowledge and twisted and perverted the gospel message. That is why it would have been better for them had they never known the truth about Jesus the Christ. But do you not know that teachers will receive a stricter judgment?
Matt. 7:21, Again, CONTEXT! Just because a person claims to follow Jesus, it does not mean they were ever saved to begin with. It’s called self-deception people. Notice in verse 23 Jesus tells them “I never knew you!” That is the key here. It didn’t matter that they claimed to know Jesus. The reality is, He (Jesus) never knew them! Sure, Jesus is God and is Omniscient. But that doesn’t mean they were accepted by Jesus. It’s like when a friend introduces you to His other friends. He’s saying “yeah, I know him. He’s with Me.” If Jesus don’t know you, it’s because you are not with Him.
1 Cor. 9:27, Again, and again I say CONTEXT! When will people learn! Any text taken out of context is a pretext! Does anyone actually believe Paul was afraid of losing his salvation? Do you really believe the race Paul talks about in 1 Cor. 9 is talking about salvation? Seriously?
1 Cor. 4:4, That’s right, Jesus is the one who judges us. Yet, Jesus also said that none of whom God gives Him will He ever lose. Not one! Jesus said: "My sheep hear My voice, and I know them, and they follow Me. And I give them eternal life, and they shall never perish; neither shall anyone snatch them out of My hand. My Father, who has given them to Me, is greater than all; and no one is able to snatch them out of My Father’s hand. I and My Father are one.” John 10:27-30.
Matt. 24:13, I noticed it did NOT say “and he who does not endure to the end will be lost.”

Of course, I’m sure you’re just reading that into the text. But you know, you are making a huge assumption here. You assume that God’s elect, or at least some of them, will not endure to the end. Why is that? Because nothing could be further from the truth.
Matt. 7:19-23, Once again, those who are thrown into the fire are not the elect. They are false believers. They put on a good show and may have convinced themselves that they are “true believers” but the evidence is in the fruit they produce (or lack of it).
Rev. 3:5, Rev.n 22:19 Again, it says He will NOT blot out their name. Nowhere does it say that God’s elect are ever in danger of losing their salvation. Nice try, but you failed.