>>518565814
Christianity won because the belief in one Almighty God ruling over the Heavens and Earth makes more sense than pagan beliefs about retarded horny gods transforming women into cows and having sex with them, or that there are hundreds or thousands of gods inside everything who get mad and curse you if you don't clean your plate or put the toilet seat down (yes this is a thing in Shintoism).

you only have to confess mortal sins. Venial sins are forgiven during the mass with the priests blessing those at mass.
Jesus defined what are mortal sins in Matt 16.
Some guy, not a pope or citing the Lord, made every little temptation into a mortal sin. You can't get out of the confessional without subscribing to the heresy and claiming Christ was wrong, and make every stray thought a mortal sin.

tl:dr You have to commit heresy in the sacrament of confession.