But ignorance does not save us from the battle. It just means that when we get wounded we have no idea where the shot came from or how to avoid it in the future. As followers of Jesus we participate in that warfare. Ugly, revolting, lizard like, or ghostlike creatures. The truth is that demons are more likely to appear in attractive forms.
Demons are deceivers.
They love to masquerade, so even Christians are fooled by them. The Bible clearly portrays them as personal beings. Demons are not omnipresent nor do they have unlimited power. Since demons are fallen angels, like angels they are immaterial and not usually subject to human visibility or our other senses. Demons are not all-knowing.