Can the devil and/or yourself lead you to a wrong form of Christianity? I have the fear that the devil and/or myself can lead me to a wrong form of Christianity, such as one subtly based on works, without you actually knowing it. Is there an example of this in the Bible, or are there passages that talk about this? Thanks.
Asuming that there is one objectively True form of Christianity, the mere existence of the wide array of beliefs, some exclusive and contradictory to others means that some forms of Christianity must be false.  Simply logic tells us that  two mutually exclusive things can't both be true.

Therefore, it follows that if some forms of Chrisianity must be false, then it must be possible for people to be led and allow themselves'to be led to follow a false form of Christianity.  

Without even going into doctrine, the clear answer to your question is "yes, you can lead yourself to a false form of Christianity".  

Delving into Scripture, we're warned of false prophets, false spirits, able to disguise themselves as spirits of light ( 2 Corinthians 11:12-15: ), leading us to believe in false doctrines... Doctrines of devils (1 Timothy 4:1), so both logically and Scripturally, it's entirely possible to believe in a false form of Christianity.

Of course, discussing which form of Christianity is the right one is not within site guidelines, but that there is a right form is a belief comonly shared across Christianity.  And we all believe that we are practicing it.