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Not all signs/miracles come from God. When Moses was before pharaoh trying to get him to let his people go pharaoh's magicians were able to counterfeit some of his miracles (Exodus 7 and Exodus 8)

In the Old Testament there is a warning about believing signs and false prophets
Deu 13:1 If there arise among you a prophet, or a dreamer of dreams, and giveth thee a sign or a wonder, Deu 13:2 And the sign or the wonder come to pass, whereof he spake unto thee, saying, Let us go after other gods, which thou hast not known, and let us serve them; Deu 13:3 Thou shalt not hearken unto the words of that prophet, or that dreamer of dreams: for the LORD your God proveth you, to know whether ye love the LORD your God with all your heart and with all your soul. Deu 13:4 Ye shall walk after the LORD your God, and fear him, and keep his commandments, and obey his voice, and ye shall serve him, and cleave unto him.

In the New Testament Jesus himself tells us that there will be false prophets and signs

Mathew 24:24 For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.

Rev 13:9 If any man have an ear, let him hear. Rev 13:10 He that leadeth into captivity shall go into captivity: he that killeth with the sword must be killed with the sword. Here is the patience and the faith of the saints.
Rev 13:11 And I beheld another beast coming up out of the earth; and he had two horns like a lamb, and he spake as a dragon.
Rev 13:12 And he exerciseth all the power of the first beast before him, and causeth the earth and them which dwell therein to worship the first beast, whose deadly wound was healed.
Rev 13:13 And he doeth great wonders, so that he maketh fire come down from heaven on the earth in the sight of men,
Rev 13:14 And deceiveth them that dwell on the earth by the means of those miracles which he had power to do in the sight of the beast; saying to them that dwell on the earth, that they should make an image to the beast, which had the wound by a sword, and did live.

Think about this ... The world does not want to believe that God created the earth in 6 days , nor does the world want to believe that God created man in HIS image . The world goes out of it's way to teach otherwise . Why do you think it would be so far fetched for Satan to use an fake alien invasion to fool people ? Much of the world would fall for it right away because to them it would mean that there is no God .
When you think of it that way it is not so far fetched .

By the way why do Catholics depict Mary as sitting between the horns of a bull ? I have never understood this because the pagans used to depict their goddesses as a moon over the horns of a bull .

So all miracles are false? Yes to be cautious is wise. But does not dismiss that it can be from God. That image converted 10 million people from pagan killings and other beliefs.

It spoke to their hearts from their former beliefs.

By the way why do Catholics depict Mary as sitting between the horns of a bull ?

DO Catholics depict Mary as sitting between the horns of a bull?