I think whichever way of expelling someone for division was used you would quibble.
The greek scriptures are very clear that division isn't an option for Christians.
You say only voicing "an opinion" but the fruitage is always far-reaching and has consequences. We have to be responsible for the words that come out of our mouths and were they lead. Some words have caused wars and sent people to their deaths and allowed others to be neglected.
Before you become a Jehovah's witnesses you have the chance to test their teachings against all other religions that are on offer and more importantly against the measure for all Religions (especially those claiming to be Christian) which is God's word the Bible.
For me there was no contest. Jehovah's witnesses have a Bible clarity no other religion or personal opinion even comes close too, right down to our insistence on unity of the flock.
Also this site and those lost sheep on it actually gives me further proof.....What happens to all those doubters and stumbled ones on here? The only thing you now agree upon is your negativity over witnesses, all else is a blur of whatever wind of teaching appeals to you whether it be atheism, mysticism, paganism, trinitarianism, anti-establishment or personal preference etc.
On here the fruitage of your choices has led you to disunity of any common held belief or teaching beyond your rejection of Witnesses.
Most threads and forum on here are simply reaffirming your negativity over Witnesses. This is your common ground between each other. I see no other on here.
And if all Jehovah's Witnesses disappeared tomorrow what would you all do? What would you talk about? Where would you go? Except your separate ways as suddenly the reason that connects you all is gone and the lack of any common held belief between you means there is no longer anything to keep you together.
Division again is your fruitage on here.