"And now I stand here on trial because of my hope in the promise made by God to our ancestors, a promise that our twelve tribes hope to attain as they earnestly serve God night and day. Concerning this hope the Jews are accusing me, Your Majesty! Why do you people think it is unbelievable that God raises the dead?"
That which is said to have come is the ERA or SEASON (karios) in which this event (as well as others) takes place - not the event itself. There is no mention whatsoever of a resurrection taking place when the seventh messenger trumpets. However, when the "last trump" referred to by Paul occurs, we are told that there will be an IMMEDIATE resurrection/vivification of believers. And not only does the final sounding of this "trumpet of God" coincide with an immediate resurrection/vivification (rather than an "era" in which a judgment - and by implication, a resurrection - of saints will take place), the resurrection/vivification is not said to be for "Israelite saints." It is for those who believed the evangel that Paul was preaching at this time - i.e., the evangel of the uncircumcision. Even before Paul's imprisonment, those who believed Paul's evangel (and consequently became members of the "one body" of Christ that existed at this time) consisted primarily of former idol-worshipping, uncircumcised Gentiles rather than Israelites (see, for example 1 Thess. 1:9).