He speaks not about the gospel - which is not anti-Semitic at all as far as I know. He speaks about the first letter of John. Different persons as far as I heard. In the gospel of John 2/22 is written they believed in the scripture (Jewish) and in Jesus (Christian).
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Then answered the Jews and said unto him, What sign shewest thou unto us, seeing that thou doest these things? Jesus answered and said unto them, Destroy this temple, and in three days I will raise it up. Then said the Jews, Forty and six years was this temple in building, and wilt thou rear it up in three days? But he spake of the temple of his body. When therefore he was risen from the dead, his disciples remembered that he had said this unto them; and they believed the scripture, and the word which Jesus had said.
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