That one requires a long answer because you always have to start with common ground.
Let me try to step through this without going into too much detail. This is just my understanding so take it as you will.
God exists. All of us humans existed before coming to the earth. God had a body of flesh and bone, we had bodies of spirit. God had a plan to help us gain bodies and become like him, it involved coming to the earth to get a body, and to be tested to see if we really believed in him and loved him ( to test our stuff, in a controlled environment). Without going into the plan, we needed a Savior to help us get back to God because we could not do it alone. Jesus said I will go and do it as you want. Lucifer said I will go and we will do it my way. Lucifer was rejected, and sent to the earth to be part of our test with those that followed him. He is not happy about not getting a body, and he is doing all he can to ruin it for us and make it hard on us because he wants us to be miserable like him. We come to the earth and now it is testing time. We get to show our stuff, but Lucifer (Satan, whatever) makes it hard on us. God sent Jesus to help us, and he sends the Holy Spirit to help us, but is up to us to seek him out for help, and ask him. Satan tries to copy and trick us all along the way. I think that Satan will trick as many people as possible into having them think they are receiving messages from God, and there are also some people out there that are just saying what they want to say in order to get gain.
I really think we are all children of God, and we can know when it is really him talking to us in one way or another.