The issue is that back in the 1920s Carey Barber and the other directors decided to move from the stauros as cross to the stauros as stake. Which is fine with me. But they because dogmatic about it just to separate them from other religions. I don't see that as Christian.
But I don't think of it as a doctrinal issue. The Romans used both the cross beam and non-cross beams in their executions. Which was used with Jesus? Since no drawings were provided by the eyewitnesses, we don't know.
But what we do know is that which prefigured this, the copper serpent, was on what was called a signal pole. It had to have some method to suspend the object. So a cross piece just does that.
What is significant is 2 Kings 18:5 "He also crushed the copper serpent that Moses had made; for down to that time the people of Israel had been making sacrificial
smoke to it and it used to be called the copper serpent-idol."
The object that prefigured Jesus' death (Nu 21:4-9, Joh 3:13-15), was wrongly used as an idol. What I am against is the continual display of the cross as it has become an idol, and people don't realize that.