Is grace irresistible? Not according to Acts 7:51. Stephen accused the Jews of resisting the Holy Spirit. So, people have resisted God’s grace and not been saved.
Really it is combination of the two, God’s grace and one’s believing that saves a person.
If God wanted them to be His could they resist?
John 6:63 The Spirit gives life; the flesh counts for nothing...
Isn't it more likely God wanted them to be resistant so that salvation would come to all men and not just the Jews?
Well, praise be to you!
With all due respect, the third person of the Godhead and and God's grace aren't at all the same thing.
Even if they were... ever arm wrestled with a five year old? They can "resist" after a fashion, but the outcome is never in doubt, is it?