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We discuss the problems of quantum theory (QT) complicating its merging withgeneral relativity (GR). QT is treated as a general theory of micro-phenomena -a bunch of models. Quantum mechanics (QM) and quantum field theory (QFT) arethe most widely known (but, e.g., Bohmian mechanics is also a part of QT). Thebasic problems of QM and QFT are considered in interrelation. For QM, we stressits nonrelativistic character and the presence of spooky action at a distance.For QFT, we highlight the old problem of infinities. And this is the main pointof the paper: it is meaningless to try to unify QFT so heavily suffering ofinfinities with GR. We also highlight difficulties of the QFT-treatment ofentanglement. We compare the QFT and QM based measurement theories bypresenting both theoretical and experimental viewpoints. Then we discuss twobasic mathematical constraints of both QM and QFT, namely, the use of real(and, hence, complex) numbers and the Hilbert state space. We briefly presentnon-Archimedean and non-Hilbertian approaches to QT and their consequences.Finally, we claim that, in spite of the Bell theorem, it is still possible totreat quantum phenomena on the basis of a classical-like causal theory. Wepresent a random field model generating the QM and QFT formalisms. Thisemergence viewpoint can serve as the basis for unification of novel QT (may betotally different from presently powerful QM and QFT) and general relativityGR. (It may happen that the latter would also be revolutionary modified.)

The present situation in quantum theory and its merging with general relativity