All five basic pillars of Islam must be adhered to by Muslims. The first two, Shahadat and Salah, are the most important. These two pillars are the doors that allow you to enter Islam’s territory, but the other three, zakat fasting and Hajj, are dependent on circumstances. If you do not have specific wealth, you are not bound to pay the Zakat. In case of illness, you are permitted to leave fasting. If you do not have finances or have some disease that does not allow you to travel, you are not liable to perform Hajj.