If you think you can’t be fooled, that’s a dangerous place to be in. We should always remember that as humans, we’re fallible, we’re prone to sin and error and to thinking we know more than we do. So we should constantly pray for guidance and for protection from sin and error, and always be vigilant, seeking counsel and avoiding things that could endanger our souls.
Regarding being fooled by demons, that’s something that can happen, but not because there’s anything wrong with speaking to angels. We can and should speak to our guardian angel to ask for their help, protection, and guidance. But there’s danger when you start trying to hear responses and interpret signs. And it’s nothing angel-specific. Even people praying to God can be deceived in this way and think they’re hearing his response when it’s actually just their own imagination or even Satan trying to trick them. People who are eager for communication, signs, and mystical experiences can easily fall into deception in this way, which can be dangerous to their souls. Even if you think you wouldn’t fall for deception, it can still be sinful to do this, potentially a form of superstition or divination.
. Regret it very much now. But, their whole belief system is based on a woman who said an angel of God gifted her with prophecy. Best source is a local parish for better teaching on this. We all do have a guardian angel. And there are the archangels we know of. But, you have to be careful with how and to whom you are praying to. We can be easily influenced in our ignorance.