You only know for sure if God is on your side
No Jesus is God in human form. Magic is human tricks.
Real magic-yes
No. The stars are not a source of magic.
No, magic (not the David Copperfield illusions) is not from God, it is demonic and comes from Satan.
no it is not but the black magic is.
No, Tolkien was a Catholic and firmly believed the Catholic doctrine that occult magic is "a lie from the Devil" and prohibited by God. However neither he nor the Catholic church has any problem with fantasy magic or stage magic as neither is real.
No, magic (not the David Copperfield illusions) is not from God, it is demonic and comes from Satan. It is evil.
Magic is most often used against bad things, the devil is a Christian entity, if someone using magic see's the devil as something that they need protection against then yes, magic can be used.
God wouldn't say that in a dream. But the devil might.
Not magic, but perhaps God is the "spark" that started the process...but, to me, the creation story covers it all, including the scientific knowledge that we have found out.
Some believe that the devil isn't real, which would mean that this question does not need to be asked. Others will tell you that there is no way to live in peace with the devil and that peace comes from God.