Teddy Roosevelt used the term "bully" as an adjective to mean "wonderful" or "superb", and coined the term "bully pulpit" to mean a terrific platform from which to advocate an agenda.
An alternate definition of "bully" as a noun means someone who harasses or intimidates. The modern definition of "bully pulpit" reflects the misuse of the church pulpit by unenlightened preachers to bully followers into submitting to their twisted views.
I used to enjoy going to church until the preacher started using the bully pulpit to rail against homosexuals. This is not the message of Jesus! I have plenty of gay friends who are the kindest, most generous people you could know. I don't attend church anymore.