Freemasonry is a secret society.
All secret societies are satanic.
Freemasonry is the most well known secret society.
Freemasonry itself is a satanic organization, even if some of the Freemasons seem otherwise like "good guys."
Here is an overview of Freemasonry:
This is not the only mention of heresy in the Bible.
“But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.” 2 Peter 2:1 KJV
And the passage you quote is Paul defending himself before Felix, where Paul is saying that the Jews consider him a heretic because Paul asserts the divinity of Christ and His bodily resurrection. Jews thinking that you’re a heretic doesn’t mean anything.
Has a Christian ever falsely accused someone of heresy? Jew, Christian or other, no man's testimony of heresy is of any value.