Welcome. I do hope that you will stick around and understand that no one is militant against CIs. People, quite simply, are relating their personal experience of being deaf. Whether they would or would not choose a CI for themselves or their child is dependent upon what they have experienced living as a deaf person. They are the experts on the topic.
Frequently around here, when someone states the actuality and the drawbacks of a CI, they are labeled anti-CI. Nothing is further from the truth. I do hope you don't buy into that. It will interfere with the ability you have to learn from the deaf.
Try and see it this way: You say you have provided your child with the opportunity to experience things he would not be able to experience. That is understandable, because you experience your world through your auditory sense. However, that is only true for those that have experience with experiencing the world that way. A deaf child is not "missing the opportunity" to experience everything this world has to offer without a CI or an HA or any artificial devise to compensate for their lack of auditory sense. They experience life as fully as a hearing child does...they simply experience the same thing in a different way. Hearing is important to your perceptions because you are hearing. If you loose it, you will miss it, and will have to find alternate ways to experience your world. But a deaf child just naturally adapts, and experiences their world in a different way just because they have the need to do that. But their world is not missing anything. Nor are they missing opportunity. They simply experience things differently. The problems arise for deaf children when that natural adaptation is not respected, and we try to force them into a facsimile of a hearing child.
When one states that a child does not have the opportunity to experience fully the world around them, it also says that hearing is superior to not hearing. That is what people object to. There are many other statements that communicate the same message. And it is offensive to be told that you are not as complete a person as one with hearing is. I'm sure you can understand that.
So rather than saying "giving an opportunity to experience something he cannot" perhaps you could say, "providing an opportunity to experience something in the only way I know to experience it." Because the actual truth of the matter is, a deaf child, or a deaf adult, can have any experience that anyone else can have. They just experience it through a different sensory channel.