"According to Quran, Muslims are not allowed to read Anti-Muslims websites/books"
As'salamu Alaikum dear brothers Fadi and Sama,
Jazakum Allah Khayr for the information that you provided. I just want to add that every Muslim must be aware of the Islamic responses to all of the attacks on Islam. This is not just for you, but also for your vulnerable children. So, while you may not have the interest to really go to the anti-Islamic websites, it is extremely important that you be ready for the assaults that your children will go through. Therefore, you must be very knowledgeable about what the infidels write and say about Islam.
All Praise and Thanks and Glory are due to Allah Almighty Alone and no one else, today we have books and booklets and Islamic bookstores, and Islamic websites that can give you all of the arguments and their refutations. You don't have to go through the painful task of diving into the infidel sites and research for answers. Most of them, if not all, are already thoroughly given to you, walhamdulillah.
Take care,
Osama Abdallah