"No man can serve Two Masters" which is simple but true. The word serve is a verb and can be employed in two different ways - good or bad. There is no, neutral-ground here; we are all in service to someone, something, somehow.
The deception involved is the bad-system has done a fairly good job of getting people to believe that they are free: they are not. Especially when it comes to Religion[Satan's tool], which means = to return to bondage. Reminder: Immanuel-Christ-Jesus came to set the captives free. Death in the Garden, deceived freedom, and our personal contact with our Creator, from them; but restored by Christ-Jesus.
Two Masters! Our Creator requires mankind to "freely" chose to serve HIM, during this earth-age. El-Satan left out the word "freely" in the Garden then, and now, because He employs deception to gain followers. Service to One of these Masters is required: it is impossible to serve both. "In Spirit and Truth" to GOD [El-o-him]; or working spreading wickedness via physical work or financing the Dark-One-world-System.
Deut.28 has clearly the "Blessings of obedience" and the consequences of disobedience. The disobedient-one automatically fall servant to the Prince-of-the-world.
Our LORD knows our heart; and where our heart is. Our treasure and hearts will be located - together[Matt.6:21]. Believers treasury should be inside the Kingdom of Heaven - right now.
The world right now serves their Master via debt. Just in the Caesar-System alone is 18,000000000000T.$ I.O.U.s of debt floating around: but its connected to everyday activities and the service of people. The time is now, that people can Not by, or sell, unless they have the "Mark of the Beast".