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Without it, soon you will have a Christian religion that thinks loving one's neighbor is all important, and in loving him, then we accept all his idiosyncracies, all his false beliefs

Loving one's neighbor is all important.

However, let's be clear how we define the verb "to love". It's not synonymous with "to accept," for example. Nor is it synonymous with "to tolerate without objecting".

To love someone is to desire their authentic good. If you believe in objective moral or religious truth, persuading someone (charitably!) to order their life in conformity with that truth is an act of love, because a life lived in conformity with truth is always going to bring one closer to authentic good than a life lived in conformity with error.