Which early Christian group believed in two Gods: the vengeful God of the Old Testament and the merciful God of Jesus?

Question

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The Marcionites believed in two Gods, one of the Old Testament who was seen as vengeful and cruel, and the other of the New Testament who was merciful and compassionate. They rejected the Old Testament and only accepted certain parts of the New Testament, placing a heavy emphasis on the writings of Paul. This belief was considered heretical by the proto-orthodox Christian church.

Which Early Christian Group Believed in Two Gods: the Vengeful