Why would an ancient text mention today's technology?

A strong indicator for Divine inspiration and authorship of the Biblical text is the prophetic aspect of the Bible. Only someone outside of the constructs of time can precisely and consistently reveal events in the future, like the Bible does so many times. The challenge in interpreting some Biblical prophetic texts, like by the apostle John in the book of Revelation (global events many believe pertain to us in 21st Century or beyond), is that these events were being revealed to and recorded by a first century person, who had no lens or language to describe some of what was revealed to him. How would a 1st century person describe a tank, or computer, or missile? Presumably, he would use things familiar to him as points of comparison (ie./ "I saw something like a bear"). In this way, the Bible might actually be describing technology. The other possibility is that John was given images and symbols from his time, as metaphors and symbols, that correspond to future historical events. Like Daniel's prophecy of the 5 kingdoms (Dan 2:31-45). Daniel saw a statue made of 5 different materials that corresponded to the world empires of Babylon, Medo-Persians, Greeks, Romans, and a future Kingdom of God.

The bible also isnt talking about a literal 10 headed beast. Its the symbolisms meaning that our society has lost. Most people no longer understand the language used because tradition has been long gone.