2) Как сегодня называют людей, которые помогают финансировать строительство архитектурных сооружений?

The text describes Ivan Syrkov and his sons as having ' выделял деньги' (allocated money) and 'жертвовал деньги' (donated money) for the construction of churches and monasteries. People who provide financial support for the construction of architectural structures are generally known as patrons, philanthropists, or benefactors. Given the context of historical construction and donation for religious buildings, 'patron' or 'benefactor' would be the most fitting terms.