Stop with the Bullinger already. I DON'T CARE what he thought, said, or did. It's immaterial to the conversation. He wasn't one of the apostles and thereby not part of this discussion.
>>No one answered if the Jewish believers on Pentecost were saved by grace? Yes or no will do.<<
Of course they were with their eye on the physical establishement of the earthly Kingdom of Christ. NO ONE until Paul divided the "church" from the nation of Israel.
Were the Jews and diaspora Jews of Acts 2 and Acts 3 who accepted Peter's message and received the Holy Spirit, born again saved by the Blood of Christ?