A little heresy mixed in with truth is like serving your children rat poison, and telling yourself --"As long as it's not the main ingredient, it will not hurt them." Quite a different issue from not getting the proportions of the original recipe exactly right.
He who has an ear, let him hear.
"If any one comes to you, whether an apostle or even an angel from heaven, with a different gospel than the one we have brought you, let him be accursed. I say it again, let him be accursed." Apostle Paul