The Nashville Statement is the work of over 150 evangelical leaders. It expresses their understanding of Biblical teaching in opposition to modern culture’s teaching on sexuality and gender. The 14 articles of the statement are fairly well written. They are a good summary of the difference between traditional Christian teaching and the modern cultural view.
From a Catholic point of view, there are no doctrinal errors in the Nashville Statement. Catholics and Evangelicals are in agreement in opposing same-sex marriage, sex outside of a valid marriage, and the modern gender ideology. I think the Statement does a good job of expressing the positive values in Christian teaching. It is not merely a condemnation of the current cultural view.
One rather glaring omission, though, is on transgender surgery. There’s no mention of that procedure, but certainly the statement as a whole implies a condemnation of that type of surgery.
Another substantial omission is the effect that these modern errors on sexuality have upon children. If an adult chooses to transition to the opposite gender, that is a matter for that person’s conscience. But when the culture and individual adults influence children to change their gender, the harm is greater. Moreover, the child is not competent to make such a decision. We do not (or should not) allow minors to obtain unnecessary plastic surgery (for the sake of vanity). We do not allow children to so much as obtain a tattoo (without parental consent). And what parent thinks it is a good idea to give a tattoo to a young child? And yet the culture and many parents are approving of a gender change? That has a much more substantial effect.
The Nashville Statement is good, as far as it goes. But the lack of any mention of harm to children is a serious omission.
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