What is the ruling on working in the Museum of Islamic Art in Egypt, which includes various exhibits that may contain depictions of humans and birds, and is working there considered assisting in sin due to its attraction of foreigners?

Visiting the aforementioned museum and working there, as well as enabling non-Muslims to visit it, is not a sin. This can even be utilized to invite them to Islam. If there is any objectionable matter, then it is obligatory to offer advice.