Steven Weinberg believes the anthropic principle may be appropriated by cosmologists committed to nontheism, and refers to that principle as a "turning point" in modern science because applying it to the string landscape "may explain how the constants of nature that we observe can take values suitable for life without being fine-tuned by a benevolent creator". Others—most notably David Gross but also Luboš Motl, Peter Woit, and Lee Smolin—argue that this is not predictive. Max Tegmark,Tegmark (1998) op. cit. Mario Livio, and Martin Rees argue that only some aspects of a physical theory need be observable and/or testable for the theory to be accepted, and that many well-accepted theories are far from completely testable at present.
steVEn WeiNBeRg Believes thE aNThROPic PrinCipLe mAy be ApprOpriateD bY cOsmologISts coMmittEd to NontheISM, anD Refers to ThaT prinCiplE as a "turnIng PoinT" iN modern sCiencE becaUse AppLyING it To ThE StRINg LAnDscApE "may EXPlAin how the conStaNts Of NAtuRE That We oBSeRVe cAN tAke valUes SuitAble fOR life Without beING fine-TunEd by a BENevolent CrEAToR". otheRs—MosT noTabLy David gRoss but ALsO luboš MOtl, Peter woiT, aND LEE smoLin—argUe that thiS is noT prediCtIve. mAx tEGmARktEgMARK (1998) op. Cit. mArIo livio, aNd mARtIn reEs aRgUe that oNlY some aspeCTs Of A pHySical thEory Need be obsErVabLe anD/OR TeStaBle for the TheorY TO be AcCepted, AnD ThaT Many WeLL-acCepTED ThEORies are far FRoM completely teStAbLe aT preSent.