This question is long debated one, with thousand of books and videos available in the topic.
The short answer is that the existence of the Quran is clear and sufficient proof by itself.
However, obviously, this answer will not satisfy everybody. The long answer is too long to type in here, therefore I'd like to point to two resources:
1. Regarding the unsustainble nature of the theory of evolution and the existence of God I recommend the works of Harun Yahya, especially his book 'The Evolution Deceit', which is available in multiple languages here: ****://www.harunyahya.com/evolution_specialpreface.php
2. To discover evidences of the Quran being the word of God, unchanged and undistorted since its revelation, please watch Dr. Zakir Naik's lecture here: ****://www.youtube.com/watch?v=3nStbKWa1T8 (this is the link to the first part, but make sure you watch all 27 parts)