Is it permissible to pray in a place built by atheists and infidels using the money of poor Muslims, and by order of the foolish, and which is claimed to be the third largest mosque after the Two Holy Mosques?

What the questioner mentioned does not affect the validity of prayer in the aforementioned mosque or its permissibility, whether it is concerning the participation of non-Muslims in its construction, the extravagance in building expenses, or even if it was built with ill-gotten money. The construction of mosques, including what benefits and facilitates worshippers and is befitting of their status, is something desirable and commendable, as long as it does not reach the point of extravagance and wastefulness in things that are of no benefit.