When it comes to The One who is able to save your soul or damn it all to Hell – I’d say THAT is the most concerning warning.
Bible Warnings against false teachings and their false teachers
The Bible gives multiple biblical warnings against false teachings – their apostles, their prophets, and their teachers. Bible warnings are explicit as to what they teach, and who is teaching them. They are not merely “mistaken”. The warnings call them “apostate” and says they “are not of us”. They are not saved. Strong warnings, are they not. And we are to continue teaching the Bible in it’s entirety.
Be a little more Christian
It seems so few know what the Bible really says about “being a Christian”. A Christian is not a name you yourself can define however you want. There is no meaning at all if anything can be whatever you want it to be. Funny one should call himself “Christian”, but say it does not matter what you believe! How rational is that? Do you know how the Bible defines “Christian”?