Romans 10:10 English Standard Version (ESV) For with the heart one believes and is justified, and with the mouth one confesses and is saved.
Believing with the heart leads to justification. Confessing with the mouth leads to salvation. That is two different acts with two different outcomes.
Justification is a bookkeeping term in which debts are recorded in red. Most of us do not understand that we are indebted because of sin and that is why most of us did not associated justification with becoming debt free.
2 Corinthians 5:17-19 English Standard Version
17 Therefore, if anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come. 18 All this is from God, who through Christ reconciled us to himself and gave us the ministry of reconciliation; 19 that is, in Christ God was reconciling the world to himself, not counting their trespasses against them, and entrusting to us the message of reconciliation.
The process for taking the debt ledger from red to black, and cancelling out debt is called reconciliation. It is balancing the books.
Romans 6:23 English Standard Version (ESV) For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.
Our sins have earned us a death penalty. Faith in Christ has set us free from that death penalty.
That is a declared state of being for eternity. Salvation is different in that it is a life affirming condition that is renewed daily. Salvation starts the minute we repent of our sins, confess our condition and seek forgiveness. Since sin has not been removed from our lives we should confess those sins in order to obtain forgiveness while we need it
If we only care to be justified, we can obtain that. We will however have to live with the consequences of sin. Consequences of sin do not go away just because we are justified.