Is Replacement Theology heretical?

Is Replacement Theology heretical

Maybe I’ve been living under a theological rock, but there’s been this debate/argument/accusation/refutation/fleeing/running away from the charge of “Replacement Theology”, as if it is akin to being a Satanist, anarchist or even a heretic.  But as a believer who actually interprets prophecy as being fulfilled, I am used to the label ‘heretic’.  Though the more I think about ‘replacement theology’  the more I realize there may not be a better term to describe the new covenant the Savior won for us.