...Roman Catholic infant baptism which purports to (only temporarily) erase original sin...
You change the subject.
Baptism permanently erases original sin.
But the minute a person starts to sin again, that sin must be accounted for again, confessed again, and absolved again.
Baptism does not erase original sin. We carry the stain of our first father's transgression with us every day of our lives.
Miraculously, that stain, that human nature to disobey God, that desire for and doing of sin, are all forgiven us by Christ's righteousness imputed to our account so that we can stand acquitted of all our sins before God. Christ has paid for our sins, therefore we are redeemed by His righteousness and His sacrifice and His obedience.
Nothing in men can pay the debt they owe to God for their transgressions. Therefore, the only payment equal to the debt is God Himself, graciously made by God on behalf of His family.
The RCC tells you that baptism gives you entrance into His church by this ficticious erasure of original sin, and then it's up to you to acquit yourself of your sins by your good works and penance for the rest of your life.
That's not what the Bible tells us.
But not as the offence, so also is the free gift. For if through the offence of one many be dead, much more the grace of God, and the gift by grace, which is by one man, Jesus Christ, hath abounded unto many. For if by one man's offence death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ.) For as by one man's disobedience many were made sinners, so by the obedience of one shall many be made righteous." -- Romans 5:12,15,17,19 "Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned: