Not true of traditional Christianity. We believe EVERYONE EVER BORN is wicked, sinful AND deluded. The Gospel tells us that God offers us an out from this abismal state.
It depends on which traditional Christianity you mean, doesn’t it? It would be true of Calvinists and Reformed, but those following Wesley had a slightly different view of the fall. Not sure what you beliefs are, but most Christians believe there is a difference between believers and non-believers. For example:
1 Pet. 4:18 “And if the righteous scarcely be saved, where shall the ungodly and the sinner appear?”
Hank