"No one needs understanding of theology to be saved. All we need is to know that Jesus died for our sins." (another poster's comment)
The Devil knows Christ died as a result of coming to Earth to save humans. False Christians know that also. See matthew chapter 7. There read just one place among many stating that it is not true that knowledge saves us.
"I'm saved because I know Christ died for my sins " is an apostate teaching. If it was true those scriptures I cited in Matthew chapter 7, Christ's own words, are a lie. So do we believe the false teaching or Christ? Also, all the epistles are a lie, if all we need to know is that Christ died for our sins to be saved.
The idea sounds nice, a tickling of the ears, for those who wish no accountability before God for themselves. But it is a teaching producing death to some ignorant people who believe it.
2 Peter 3:9 "The Lord does not delay the promise, as some esteem slowness, but is patient toward you, not willing
for any to perish, but all to come to repentance."