Not only must all Masons profess a belief in a Supreme Being (not just an impersonal originating force), but they must also profess belief in immortality of the spirit.
Now, as to your vague malaise about immortality of the body, that would likely reflect various odd ideas that individuals have on many subjects. As usual, it is important to distinguish what individuals confect from teaching from what is actually taught. If you have particular ‘strange ideas’ you know about, then stating them would be extremely helpful in clarifying the matter for you. Like many Masons, I am always willing to help make things clear, though I will not engage you in any polemic. In one of our charges, we are strictly forbidden from engaging in argument about misunderstandings.
My Aunt Mary told my Aunt Lorraine, at my uncle’s viewing, to stop stroking the my uncle’s over coat (which Mary had advised her to have put on him) because poor Jim was going to need it.
Then about two years later, when a third aunt died, Mary refused to get out of the car at the cemetery because she was so upset that Isabel had been cremated, that she could not watch.
I thought at the time that Mary was just old and not thinking straight, but my sister insisted that it had something to do with my uncle and the Masons. No one else in my family believed anything like that, even the Masons or Eastern Star members.