You agree with their tenets, why don't you call yourself Satanist? You do believe that Satan/Baphomet exists, don't you?
Do you prefer Christian mass theatrics? You know, cracker turning literally into the body of Christ and wine into the blood of Christ, all at once in all churches across the US, every Sunday. Is that why you are a Christian?
I don't agree with any of their tenets they are flawed. I agree with what I wrote immediately above which might sound superficially similar to their tenants to a non discerning reader but if you look closely you will see they are different each and every one.
Symbolism is important. It's carries meaning both purpose and principle. That is why the rituals of Christianity matter they are important. It is also why the rituals of the Satanist matter.
I believe evil exists as objective reality. How you want to envision that evil and reduce it to a form the human mind can grasp is up to you.