Hi Brijesh--
I am not afraid and do not believe that Islam can be defeated by these acts. However, I like to point out to those who spread lies, regardless who they are. There are many calling themselves Muslims spreading lies about others as well. I just like to tell others about them.
I do not understand your last question: "If you are protecting eslam then you are also doing the same kind of sin. Can you see yourself??" If I am protecting Islam I am sinning? How is that so, please explain? As one who accepts Islam as my faith, I think it is my duty to defend it within the truth.
You said: "I think you do not believe in eslam and has much more doubts about it capacity, nobality. If it is not so, certainly you do not believe in people's wisdome. What will you do of those people who do not have wisdome."
According to my religious teachings, Islam will always remain. It will never disappear. For centuries enemies of belief in One God SWT have tried to destroy the Message. They may have distorted it, but it always managed to survive (through Hebrews, Christians, Muslims, and others who received the Message). I have no doubt in Islam's abilities and its nobility to survive. Some people do lack wisdom, and there is nothing I can do about it. At the same time, I have a duty to point out to lies.
My religion (Islam) teaches me that I should witness to the truth, even if the truth is against me.
"O You who believe! Stand out firmly for justice, as witnesses to God, even as against yourselves, or your parents, or your kin, and whether it be against rich or poor, for God can best protect both. Follow not the cravings of your hearts, lest you swerve, and if you distort justice or decline to do justice, verily God is well acquainted with all that you do." (Noble Qur'an 4:135)
Peace.