Logical discrepancies in Jesus' goals, demons and the last hour?
In the first three chapters of Mark, a little more detail is given on exorcisms performed by Jesus. In all of them, he always tells the demons to not say his name so that it does not screw up his long-term goal. Why would a demon even help with that? If these demons were angels of Satan, then why didn't they just put up a large sign telling everyone that he was the Son of God so that they can ruin his plan? I am very sure that these demons were angels of Satan and not just independent antagonists. After all, when Jesus was accused of driving out demons with the power of demons, he explicitly stated that such a thing causes a division in oneself. (therefore implying that all demons that he drove out were Satanic minions)
Also in Matthew 9: 29, there's another contradiction. The demons inside of Legion asked, "Have you come to torment us before the appointed time?" How would they know that it wasn't the appointed time yet? As for signs, Jesus said that nobody but the Father knows the time or hour of judgement and he also derided Pharisees in chapter 13: 38 - 42 for asking for a sign. (also saying that they would receive no type of sign)
Can someone please clear this up? It will be appreciated.