How long ago did islamism form?

Answer 1

Islam as a religion as it is today was introduced by Prophet Muhammad by the end of 6th century (he was born at 571 AD, and the prophecy came when he was 40 years old. please note that the lunar calendar of Islam has less days in a year, around 10-11 days a year)

But the monotheism can be drawn back to the age of Abraham (Ibrahim, in Islamic term), and further to the 1st prophet Adam.

Islamism, however, is something else. It is a political ideology whose goal is to bring the religious tenets of Islam into the daily functioning of a government and its laws. Islamism is a modern movement whose roots began contemporaneously with the rise of Salafism in the late 1800s and early 1900s in Egypt. Islamism is not by nature violent or expansive. Many Islamist movements have concrete nationalistic goals such as the Islamists in power in Turkey.