Yes. Christians are open to false teaching and being led astray, if you think you are not then tread carefully. 1Cor 10:12.
Peter had to be corrected by Paul about circumcision being binding on gentile believers. Was Paul wrong for doing that? Many Christians misinterpret the scripture when it says " Judge not" (Matt 7:1-5) The meaning here has to do with not being a hypocrite, ie don't judge someone when you do the same thing.
See article here called "Judge not".
Here are some links to good articles and media on heretical teaching, saying what they are, why we should avoid such teaching etc.
The Shack
Link1
The Emergent Church
Link here
Rick Waren and the purpose driven concept
Link here