Complex sentence: In the same manner that the promotion of poverty in underdeveloped nations as "cultural diversity" is unethical, it is similarly unethical to promote all religious practices simply because they are seen to contribute to cultural diversity.
Split into simpler sentences: In the same manner that the promotion of poverty in underdeveloped nations as "cultural diversity" is unethical. It is unethical to promote all religious practices simply because they are seen to contribute to cultural diversity.