Hi _bowtie_bovine
I've realized I've overlooked your meme and happened to write something about Eternal Security that is actually in relations to this.
imgflip.com/i/5kwwdd
My answer to your question is that it is still valid, even if you've left Christianity. If you are saved then when you leave Christianity you will eventually come back to it.
There are three main reasons for leaving:
1. Disillusionment
2. Faith being ruined
3. Sin
People have left the faith for the reasons stated in 1 & 2, but the Bible is mute on those. Instead, it speaks of 3. I think it is because if it is for 1 & 2, the saved person will surely come back. That leaves 3 because people come to Christ for various reasons & not all of them are correct reasons
Some come to Christ for the perks, others just so they'll be safe from damnation.-- neither one truly repented & believe (Mark 1:15 & 1 Corinthians 15:3). And when they're confronted with their sins, when they're no longer benefitting, Christianity becomes unpopular, or when persecution arises, they'll leave & never return (Matthew 13:18-23 & 1 John 2:15-16).
And still others have had a preconceived notion of God, but when they begin to hear from His words that offends them, they'll leave.
If they truly believe, the Holy Spirit will convict them of it, telling them that they must accept God for who He is & not what they want Him to be. However, if they're not saved, they have only their conscience. If their conscience tells them the same thing, they'll ignore it & stubbornly keep the god they want. With these people, they are guilty of idolatry (Exodus 20:3).
SCRIPTURES ONLINE:
https://www.biblegateway.com/passage/?search=Mark+1%3A15%2C+1+Corinthians+15%3A3%2C+Matthew+13%3A18-23%2C+1+John+2%3A15-16%2C+Exodus+20%3A3&version=ESV