“Catholics and most other Christians believe the Gospels when they say that the saints are not dead.”
The Gospels do not teach that the saints are omnipresent and omniscient, sharing in the divine attributes of God. This strawman of yours won’t help your cause.
You are basing your entire straw man argument upon what you believe the Gospels no not say. I am basing my counter to your straw man upon what they do say. One verse in Daniel, which by the way is not a Gospel, does not contain all that is known or revealed about spiritual beings, nor does it claim that all spiritual beings have the limitations and capabilities of the angel in Daniel.
I am not here to engage in a debate or even an argument (as opposed to a quarrel). The veracity of Catholic teaching is not in question. The bottom line is that I have studied the Bible, theology, philosophy and Catholic teaching extensively. I have read and studied the works of many brilliant theologians along side the infallible teachings of the Magisterium. It is against this that I compare and contrast your opinions. I find them, for want of a better word, puny.
Peace be with you