"The gospels were written decades or even centuries after the alleged Christ"

No.

What?

The truth of the antecedent in your proposition is not established. Neither is the truth of the whole conditional established.

If the Disciples were put to death for claiming that Jesus had risen and that He was God, and if they suddenly stop making that claim, obviously, they are not going to be put to death.

https://carm.org/disciples-stole-jesus-body-and-faked-his-resurrection

"A sufficient motive would have to be offered to account for the disciples' intended deception."

"At best all anyone can do is guess about what the disciples may have been thinking or what might have motivated them to devise an elaborate deception. Guessing is all that can be done. But we would need to ask if any proposed motives of the disciples could be harmonized with the facts of their preaching and teaching about truth, long-suffering, patience, kindness, and love. No one can read their hearts or their minds and insert into a scenario 2000 years old the motivations of people long gone. It is simply best to let the facts speak for themselves. They lived, suffered, proclaimed, and died for the truth of the resurrection."

No!! Already been refuted!!

Because it doesn't make sense.

Excommunicate is derived from Latin
Herem is Hebrew