It is more than secrecy.
Masons will accept a member from any religion.
The Masons teach Indifrencism - all religions are equal and no religion teaches The Truth.
As Protestants, we don’t need to know why you believe what you believe.
They practice satanic rituals. They did it at the George Washington Memorial.
Masonry requires that a man profess a belief in Deity and the immortality of the soul. Kind of like the Boy Scouts (at least way they used to be - I don’t know anymore). If it required more than that then it would lose its non-sectarian nature and put it in competition with churches.