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Yes, unless you agree that all good deeds of Christians are also irrelevant to the God. <---- take away this "the" too.
Paye, Marc; Maibach, Howard I.; Barel, André O (2009). Handbook of cosmetic science and technology (3 ed.). Informa Health Care. p. 703. ISBN 1-4200-6963-2.
Foreskin. However, it is useful in reminding God of his covenant (see the story of Moses's child). You don't expect God to remember everyone he makes a covenant with?
At the end of debate like this, Christian can always claim the body part is useful because it is "pleasing to God". After all, God's taste is quite mysterious to us (see Leviticus about burnt offering).