Perhaps God told his story and Satan told ten other stories for people to believe, but on the other hand maybe the true God gave them the lie to believe, when they reject His truth.
Here are your questions and my answers.
(1) Do you still think that your religion's creation concept is a fact? Why?
I know it is a fact because the Holy Spirit inside of me tells me I belong to God and time and time again the Lord has flooded my mind and body with his peace.
(2) Do you think the other concepts are facts or myths? Why?
Myths, because I know and am known by the true and living God
(3) IF God really existed, why had s/he told different cultures different stories?
When God cast Lucifer to the earth, he was allowed to have certain ruling rights here by God until his coming judgment. He is called the Father of lies and the god of the earth. He can even appear as an angel of light. Perhaps this is why but God knows.
P.S.- Best wishes in your search for the truth.
What other religion is so perfect as Christianity? A Savior dying for the sins of man kind. A Savior who is God himself, by whom created the heavens and the earth?
What is a holy God supposed to do with people who are sinners, if there is an everlasting life, are they able to go in there in their own goodness or righteousness?
God looks at sin a little differently then you and I do. He is perfect and completely holy.
What do other religions do about sin? Well, we know what Christianity is all about.Christ died for our sins, because he doesn't wish that any should perish.
It seems like a myth to some but why couldn't there have been a garden of Eden and a God who walked and talked with Adam and Eve in the cool of the day? Do you not believe what the bible says because you see all the other religions with their myths and compare them?
Jesus performed miracles, healed the sick, raised the dead and forgave sins while on the earth, and the religious people of his day wanted to kill him, but it pleased God the Father because it is why Christ came to the earth, to die for our sins and that means your sins also.
"As Moses lifted up the serpent in the wilderness, even so must the Son of Man be lifted up;
so that whoever believes will in Him have eternal life.
"For God so loved the world, that He gave His only begotten Son, that whoever BELIEVES IN HIM shall not perish, but have eternal life.
"For God did not send the Son into the world to judge the world, but that the world might be saved through Him.
"He who believes in Him is not judged; he who does not believe has been judged already, because he has not believed in the name of the only begotten Son of God.
"This is the judgment, that the Light has come into the world, and men loved the darkness rather than the Light, for their deeds were evil.