Promises Message

future and a threat of hell for those who pass the message?

For example: Christ came simply to bring light (to teach people how to worship in Spirit) to dispel the darkness. It was more than a promise. More on my biography.

And he said he wanted people to become "children of light," not children's blood.

So do the followers tend to take a good thing and do something the founder never intended?

Yes.
Message from the Founder kills ego is beyond the tolerance of ordinary supporters.
So with the passage of time, the real massage is converted into a massage promises of what the preachers and followers.

Yes, many people who gave the message of Christ
Smite mankinds sins, for a message that does not
the true message of the biblical Word of God.

The message is transformed into marketing in a profit (not prophet). They need to start paying taxes like Jesus said "Render unto Caesar what is Caesar's." Then, the fraudsters would go away.