Acts 10:44 While Peter was still speaking these words, the Holy Spirit came on all who heard the message.
Note how God used every opportunity to reach everybody. Even though Peter was preaching to the people of Israel, the Gentile also heard the message. They were convicted by the same message as the Jews!
God does not give one message to one people and another message to others – the same message goes out to all so we can all share in Christ.
We have one Father, one Son and one Holy Spirit – and even they are one (though we may find it hard to understand).