I work in a hotel casino in America as an acrobat. Is this work a sin?

Praise be to Allah, the Lord of the World; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.

It is unlawful - according to Islam - to work in such a hotel. Whoever wants to work in a hotel, he should know the source of its revenues and make sure that it does not deal in any Haram activities as it is forbidden to work in a hotel where Al-Fahisha (adultery, fornication, evil acts, including words) is committed, or where there is alcohol, gambling or musical performances with dancing and other bad activities.
If the hotel is free from all the above and if its operations conform with Islam, then there is no harm in working there.
Allah knows best.