That one needs some time to think through how to best respond to it. Let me mull that one over some.
The idea of eternal security is a matter of debate amongst Christians. It hasn't been settled in 2,000 years and I doubt that we'll settle it now, but I'll give you my take on it after thinking it through some more.
Some points to ponder. Jesus said that no one would be able to take His “sheep” from Him.
John 10: 27 My sheep hear My voice, and I know them, and they follow Me; 28 and I give eternal life to them, and they will never perish; and no one will snatch them out of My hand. 29 My Father, who has given them to Me, is greater than all; and no one is able to snatch them out of the Father's hand.…
Now, if a person proclaims Jesus as their Savior, which scripture also teaches cannot be done without the Father drawing them, and they are “given eternal life” who is it that will be able to “snatch them out of the Father’s hand”? I would take “no one” to include the person saved since we know that it’s Satan who would draw someone away from Christ. If they can be “snatched away” than the Father is not “greater than all”.