If you believe the Bible is Gods word you are taking on an impossible responsibility.
You are presuming that just because a being does something miraculous that that being is neccessarily what it claims to be.
The Bible says the Devil transforms himself into an angel of light. Well if the Devil can pose why can't any other entity impersonate God.
We are only human. Somewhere in this universe there is probably some advanced civilization that could use some wonderful technology to put on a magic show. And because of this you have to believe them or die? How do you know you are not being pacified for the round-up and transport to the slaughter house. We've got some valuable protein in our flesh.
Come on.
Fortunately, miracles are kind of rare to the point of disappearing so there is no need to believe in much.