No, just by philosophers and a lot of other academia.
They claim something is true.
Are you denying this?
If you claimed that you had a personal experience or you claimed that something is useful then yes they are truth claims.
If you just use the ritual for peace of mind or what...
Actually Humanism while born within Christianity, was originally group of Christians who decided to use secular philosophy as their basis of ethics rather than theology.
They still owe their human-centrism to Christianity though.
Seems to have history on it's side.
Look at times where we used rationality instead of theology.
Unlike some people, the vast majority of people have empathy. When combined with logic, empathy can make a stable ethics system. I have studied secular ethics a lot as it is one of my majors.
On...
I understand you pain, having come from Wicca myself.
But I find that when you think logically about the world then you do feel better, I usually use rpgs to escape to fantasy instead of false belief.