No def not, most people I know and myself would be killed under any religious moral system because their entire existence is sin because that's what's written, but they're some of the kindest, most humanist and sane people I've met, they just aren't religious because most religions would want them dead.
Often they have individual moral frameworks that are some variation of the marxism-adjacent maximization of happiness/minimization of suffering or nietzchean fulfillment of potential.
I also have no problem calling it sinful either if it's a useful shorthand tbf, it's just words after all.