All of these are absolutely true FOR THE ONE WHO CONTINUES TO BELIEVE. They have zero application to the one who has stopped trusting in the blood of Christ. The promises belong to those who continue to believe. That's why we are exhorted and warned to keep believing what we first heard and believed.
The problem is not a matter of denial or rejection so much as is it is a problem of reading the promises of God out and away from the context of the whole counsel of God, which shows us that the sure promises are only sure
for the one who continues to believe.
And here's a perfect example. You left off the last part of 1 Peter 1:5. You left off the 'through faith' part. We are kept by God's power for the day of salvation
THROUGH FAITH.
"5who are protected by the power of God through faith for a salvation ready to be revealed in the last time." (1 Peter 1:5 NASB)
There is no argument or debate possible about the necessity to keep believing in order to be saved because the Bible is clear about that. The only real question is, "can a true believer stop believing?" But consider that even Paul warns us to not be arrogant, but rather fear in regard to continuing in the kindness of God:
"19 You will say then, “Branches were broken off so that I might be grafted in.”20 Quite right, they were broken off for their unbelief, but you stand by your faith. Do not be conceited, but fear; 21 for if God did not spare the natural branches, He will not spare you, either. 22Behold then the kindness and severity of God; to those who fell, severity, but to you, God’s kindness, if you continue in His kindness; otherwise you also will be cut off." (Romans 11:19-22 NASB)
So apparently Paul thought it quite possible that we could stop trusting and clinging to God's kindness in salvation.