I agree that "the sheep that cannot be snatched out His hand are the kind of sheep that FOLLOW Jesus." But I also know we will never follow Jesus perfectly. And we see in John 10 that the issue is how to be saved
9 I am the gate; whoever enters through me will be saved.[a] They will come in and go out, and find pasture.
26 but you do not believe because you are not my sheep. 27 My sheep listen to my voice; I know them, and they follow me. 28 I give them eternal life, and they shall never perish;
It's all laid out right there. First step in obtaining salvation, Listen, second step, follow, third. God gives us eternal life and we will never perish. It's not saying we never perish only if we always follow perfectly and never slip up or fall into temptation.
"no one will snatch them out of my hand" Including Satan! The only way to remove our selves from his hand is to totally reverse the process, first, stop following, second stop listening, which will eventually lead to no longer believing, which means we are then no longer his sheep.