Again, posting truth, salvation is all of grace and nothing of our merit, does not even address the issue.
My point is His choice is not based solely on what we believe, but also on His recognition of our commitment and devotion to Christ, making Christ the overriding priority of our lives. So even if our understanding is flawed, just as perhaps a child might have a flawed (or limited) understanding, but has given his or her all to Christ, then God might credit that faith as righteousness, and transfer that youth into Christ.
Again, salvation depends not of what we believe, but on the grace of God who may credit our faith as righteousness, when it does not merit His grace. That would be works!!
I'm sorry, and it gives me no pleasure at all to say this, but you are effectively denying the Gospel. When Paul asks the Corinthians,
'...What do you have that you did not receive?' (1 Cor. 4:7), the answer he expects is "nothing, Paul!" Not, "Our commitment and devotion to Christ of course, Paul!" No! We bring
nothing to Christ. If we did, it would mean that His shed blood was not enough to save us.
'....When we were enemies, we were reconciled to God by the death of His Son' (Romans 5:10).
And it's not true to say that it doesn't matter what we believe. To believe, however sincerely, that the moon is made of green cheese won't save you. To believe that there was such a person as Jesus of Nazareth who lived a long time ago and did a lot of good stuff saves no one. Even to believe that He is the Son of God won't help you unless you have seen yourself as a sinner and have trusted in His atoning sacrifice to save you (1 John 1:8).
Salvation is
By grace alone. Purely through the undeserved mercy and favour of God
Through Christ alone. Only His perfect life and atoning death can save sinners.
By faith alone. Faith is the medium that unites us to Christ, but even that is the gift of God,
'That no flesh should glory in His presence' (1 Cor. 1:29).
According to the Scriptures alone. No human wisdom, no scheme of angels or men (Gal. 1:6-9).
To the glory of God alone. Of course.
'... That you may proclaim the praises of Him who called you out of darkness into His glorious light' (1 Peter 2:9).