Maybe, maybe not. The fact that Stephen knew that one can resist the grace of God is the topic of the verse.
When we receive Jesus, the Spirit gives life.
We share the joy of being in Jesus' hand. We just don't agree on this.
Ph. 2:13 for it is God who works in you to will and to act according to his good purpose.
Acts 13:48 When the Gentiles heard this, they were glad and honored the word of the Lord; and all who were appointed for eternal life believed.
If it is God who waits for us to decide to believe, or not, then God is not all powerful, or omniscient.