The term Christianity is too broad, just as the Title "European" would include all the nations that have had been in conflict with each other such as Spain and England; Germany and France, Christianity includes Catholics that executed other Christians. The very title "Protestantism" reveals the divide within Christianity. There are too many denominations but there are six major groups: Roman Catholic; Orthodox; Reformed; Protestant; Evangelical; and Independent. Each alone have over 100 million members, which deserve separate status, Just as religions based on Hinduism: Buddhism, Sikhism and Jainism are listed separately. You don't need to define it just allow signers the choice. Given the choice I would select "Evangelical".

Dear the Global Ethics Board of Committees.
Thank you for your invitation for me to join in your future action plan on the Global Ethics Project.
I am working on this project to support with your action plan now.
I look forward to contact with you soon.
Best regards,
Szu Ying Anne Lee
Founder of Lee's Family-Holistic Idealism Education Foundation

I think it is an important and necessary step to include an ecologic responsibily in the declaration as well, because its urgency is currently growing.

The implementation of these called out Global Ethics would definitely improve the quality of life for millions. We as global citizens can start with small steps to help to alleviate poverty and individually learn more about the root causes of poverty to then take action at greater level.