What is the right religion? and who is the real devil?

Since I was born and I have some doubts about my religion and other religion, I asked my self if I was born for Jewish family I will be Jewish where if I was born for Christian family I will follow the Christ.

People will have discrimination against other religions according the roles that their family inherit them so why we don't think deep in our religions and think seriously why we came to this earth and who is our real enemy in this life.

I hope to give me your opinions in my words, to walk together toward our reality, the real reason that bring us to this place did we come to love each other and accept each other or we come to hate and kill each other.

If god wants us to follow the same religions and have different attitudes and different characters, why doesn't he create us the same? may be because he wants us to love each other even if their are differences between each other.

If god wants us to give and share, why does he create this high ego for us? may be because he wants us to defeat our negative emotions not to defeat other religions.