You'd be surprised. I remember a debate thread a while back (in the apologies or Christian Ethics board or something like that) where someone had asked about God as mother, and plenty of folks felt that a Baptism would be perfectly valid if it was done, "In the name of the Mother, Redeemer and Sustainer," or similar formula.
It's interesting that Bishop Martins said that in charity the term heresy should not be used lightly, and only when something contradicts the creeds. We name God as the Father, Son and Holy Spirit in the creeds. Would this be crossing the line for him, or is the line simply being redrawn (since one assumes if the BCP is re-written it would also involve re-writing the Creeds to remove offensive language from them). Or could it be the creeds will be dropped as the ACC Liturgy Commission is proposing with its revisions to the Daily Offices?
I do not speculate with regard to what Bishops Martins believes. I agree that we should not use the word "heresy" lightly.
I do not expect an liturgy committee to remove the Creed from the Anglican liturgy.
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LET US DEAL WITH HERESY
In this age, we do not kick folks out of the Church, calling them heretics, because they disagree with the Church with regard to a doctrine or the definition or requirements of one of the sacraments. Perhaps, this was need in the 2nd, 3rd and 4th centuries as the Church was consolidating its doctrine and its power, or not. It certainly does not seem appropriate now.
With regard to the form of baptism, it hard for me to call folks heretics because they baptize (e.g.) in the name of God, Jesus and The Holy Ghost. Is it heresy to call God mother instead of father; probably not. These folks still have the Trinity, with Jesus as fully man and fully God, something that many of those in the early Church did not have. The form of baptism is wrong in many ways, but no heretical if these folks really are baptizing in the name of the 1st, 2nd and 3rd persons of the Trinity. After all, is not "father" also an aspect of God. How would you feel if we baptized in the name of God the father, of Jesus the Son and of the Holy Ghost? Do we consider Quakers heretics because they don't baptize at all? Of course not!
As Bishop Wright indicated that he wouldn't consider someone a heretic if he didn't believe in the virgin birth. Of course, Bishop Wright is clear that the virgin birth is the Truth and that there is no question, but heresy is another thing entirely.
MAKE NO MISTAKE
I oppose calling God "mother" in baptism for many, many reasons. This is one command of Jesus that we have held true to for almost 2000 years.
BOTTOM LINE
We should be able to define Christianity and what defines a Christian. It is clearly disobedient not to baptize and regularly receive Jesus in the Eucharist. Is someone a heretic or a non-Christian because they do not do so? Do we accept members of all denominations as Christians? Or almost all (perhaps excluding JW's, Mormons and Christian Scientists)?