You just have not identified the source of the communication.   He sometimes communicates in unexpected ways.   As far as your last statement, that is where you will have a problem.  If you do not want to believe the Bible, you would notice that many of the people that returned from the dead had changed hearts on the subject.  You might want to consider some of these people's experiences
http://www.near-death.com/science/evidence/some-people-were-dead-for-several-days.html
http://www.near-death.com/science/evidence/some-people-were-dead-for-several-days.html
and consider this verse.
John 3:17 "For God did not send His Son into the world to condemn the world, but that the world through Him might be saved. 18 "He who believes in Him is not condemned; but he who does not believe is condemned already, because he has not believed in the name of the only begotten Son of God."
Again, it is your choice.