But if he let man corrupt his word, he is basically lieing to us. And therefor, in this world there is no real truth. Do you believe God to be so evil to leave us without a real truth? Do you think he is capable of lieing? Of letting His perfect words, being corrupted?
You're making too many assumptions here.... Firstly, God can lie to us, because he's God, he can do whatever he wants. I'm sure you agree with that.
Second, a lie from God does not mean there is no truth. That is not possible, because there is always truth. There is a way things are, and God would know the way things are.
Third, despite all that, man corrupting his words does not mean he lied. It means man misinterpreted and misinformed.
Fourth, you keep saying he is perfect, yet we are flawed, yet he created us. If he can do that, what makes you think he is A) incapable of lies, or B) incapable of having his words manipulated by his own imperfect creation, when we see man manipulate his word on a daily basis in the form of thousands of religions.
You refer to a real truth, but where is the one truth? As we are bombarded by all these religions, many of which share a common heritage (for example Christianity, Judaism, and Islam) which one is the real truth?
If God's word cannot be made flawed by man, then how do all these other religious texts exist, preaching different words? Why would God allow so many texts to exist with so many contridictions?
There's only one answer.
The answer is in you, not a book. The one truth is that we were made with a free will with which to perceive the world around us, so take advantage of it and seek the real truth on your own... Don't seek it from a book. This applies to people of all nations and all religions.... Do not let your heart be swayed, because yes, the truth is inside of you. You just have to find it.