That's self refuting. It can't possibly be dangerous since it can't be lost.
So what if they are doing everything wrong? You already believe there is nothing right they can do to better their chances.
If you want a True monergist and faith alone approach to this issue. You wouldn't complain to us about what they are doing wrong.
If I actually believed what you SAY you believe, which you clearly don't, Step one is ask God to fix it, and you are DONE.
They cannot correct themselves nor can you correct them into the good works of believing the gospel as you see it, that's all tied to good works. And if they are already saved since you believe they can't lose it there is nothing dangerous at all.
You can be in middle of the ocean, thinking your gonna drown. You see a ship, yes your saved! they throw a lifesaver, yes your saved. they get you on the boat yes your saved! take you back home, yes your saved.
When the ship came you can choose to not wave your arms around and hide underwater, you can choose not to grab that lifesaver, you can choose to jump off the boat.
The disciples the same way describe being saved past, present, and will be in the future.
James 2
14What use is it, my brethren, if someone says he has faith but he has no works? Can that faith save him?
Now I'm not particularly bringing Faith Vs Works here. Lets make it a given its faith alone. He doesn't say faith has saved him, but a future event.
The entirety of the chapter if not the whole books is absolutely meaningless if Once saved always saved.
In a nutshell you Baptist and your Calvinist-Baptist have this issue:
James 2
1My brethren, do not hold your faith in our glorious Lord Jesus Christ with an attitude of personal favoritism.
You think hey I'm chosen or saved, well I'm home free with a license to sin.
The first thing the devil taught was once saved always saved:
4The serpent said to the woman, “You surely will not die! 5
The first sinner taught Calvinism:
12The man said, “The woman whom You gave to be with me, she gave me from the tree, and I ate.”
Did Jesus then Lie whn He statted that NONE would ever be lost again?
And Jude at end of his book also lied that Jesus forever keeps us saved?