In a joint letter, the Anglican bishops warn of "major problems" and the danger of division if the Church changes its current position.
They said that the traditional Christian view of sex as being for heterosexual marriage alone "is the teaching of Scripture" and "therefore expresses the character and will of God".
They also declared that "recent history tragically demonstrates that introducing changes in teaching and liturgy has consistently divided Anglicans globally and within provinces".
The letter states that while modern day questioning of traditional Christian views on sex and marriage cannot be dismissed out of hand, "neither can we simply abandon what we have received in order to appear relevant and avoid feeling uncomfortable".
The letter has been signed by the Bishops of Carlisle, Durham, Ludlow, Birkenhead, Willesden, Peterborough, Plymouth, Blackburn, Maidstone and Lancaster, and by the former bishop of Shrewsbury.
It is understood other evangelical bishops are also in agreement with its contents.
It has been sent to Bishop Christopher Cocksworth, who is chairing the Church of England's 'Living in Love and Faith' (LLF) project.
This aims to tackle the "tough questions and the divisions among Christians" over gender, marriage and sexuality.
The project is due to report back in early 2020.
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