What is the ruling on taking donated money from a polytheist to use for charitable and humanitarian projects, and is it permissible to use part of it for personal purposes?

There is no harm in benefiting from the wealth of non-Muslims and spending it on specified charitable causes. The Prophet, peace and blessings be upon him, accepted gifts from non-Muslims, and it is permissible to build mosques with their wealth. However, it is not permissible for an agent to take any of this money for himself without the principal's permission.