And that is absolue total bullshit.
If you want a valid claim to being a Christian (and expect the promise of salvation) you must live in accordance.
"Whoever believeth in me shall have eternal life."
A little catch here. If you "believeth in him" you live in accordance with the principles he hath layeth before you. If you don't, then your claim of belief is bogus, and will be recognized as such (see New Testament).
It doesn't matter a piss what religion you claim to adhere to, you follow that kind of bullshit St. Peter's gonna pull the lever on the trap door to hell, Angel Michael will fillet you with his flaming sword, Anubus will toss your heart to the Eater of the Dead, you will be reincarnated as an untouchable with the job of cleaning latrines at a leper colony, or similar - or perhaps all of those. The rules don't vary much from one religion to another.
A major reason I departed the devout Christian faith of my childhood was realization that 99.97 & 1/3 of persons claiming to be Christians are nothing of the sort, not even close.
Let 'em all burn in hell (or whatever punishment they think they are going to escape by unsupported "belief").
"Belief" cripples the mind.