“….It is not good therefore that these things be done by unworthy persons. This is why, under no circumstances, do we authorize excommunicated persons [heretics, schismatics] to paint icons in the holy churches; for the same reason, they cannot teach until they have turned from their error. After this decision which we have made, if any such person attempts to paint holy icons in the church, let him be deposed if he is a cleric and deprived of the holy Mysteries if he is a layman.”

The decree was written during a time that there were no Christian religions other than the orthodox church. The decree by the Council has been carried over to refer not only to those Orthodox who have abandoned the faith but to any denominations as well.
This articles stands in defiance of what the Orthodox Church has always taught regarding who and who may not paint icons. Those outside the faith, are not baptized into the fold of the Church, they are thus deprived of Grace and their “icons” are nothing more than empty vessels or religious pictures.

https://www.traditionalbyzantineiconography.com/2017/11/09/he-alliance-between-the-deconstruction-of-orthodox-iconology-and-modernized-orthodox-theology/