Believers are called to present themselves as "living sacrifices," holy and acceptable to God. It is reasonable in light of all that He has done for us.
God always has left a remnant of true believing Jews throughout their history. There remains a remnant during the church age (Messianic Jews) and at the end of the Tribulation the entire nation will receive Jesus as their Messiah.
God used the power of preaching authenticated by miracles to draw sinners to Himself. The Jewish leadership were powerless to stop the advance of the Gospel.