Despite the invite I'm not going to attend a christening.
Is there a reason you don't want to go?
I don't want to and I don't care about what others think.
It's important to be able to make your own choice. If you don't want to participate in the ceremony because it is religious, that is okay and understandable.
Everyone thinks like me, but I'm the only one who is vocal about it.
While I don't think everyone thinks like you, I do think many agree with your beliefs and right to make your own choices based on them. If attending the christening is against your values then you definitely should not go.