This is a great example of a nonsensical question.
2 Corinthians 11:14 claims that "Satan disguises himself as an angel of light".
John 8:44 states that Satan "is a liar and the father of lies".
The question presupposes that 2 Corinthians 11:14 and John 8:4 are in fact true. It then goes on to suggest that if in fact these verses are true, mightn't they also be false?
The answer is quite obviously, no. If they are true, then they are true, and it is then unquestionably not the case that they are false.
However, let's ignore the fact that this question presupposes the exact opposite of what it attempts to prove and get to what was probably really meant by the questioner: how do we know that the Bible is true?
This question has already been answered in another article on this website: