Idolatry is by all accounts the central issue in the Torah. I think it is perhaps because some people have never finished reading the Old Testament [Tenach] in Hebrew that they are not aware of this fact.
But as you go through the Old Testament you notice that this is the most essential theme. I admit that keeping all the mitzvot comes in a close second but this is clearly what all the prophets considered the most essential aspect of the Torah. For this reason you would think that people would spend more time in clarifying exactly what is idolatry. After being involved in Breslov for a good number of years it started occurring to me to attempt to bring some clarity to this issue.
I want to first of all suggestion that (1) Idolatry has a close connection with spirituality.
(2) Also I want to suggest that it is easy to become an object of idolatry. Anyone can do so with one word. ("Serve me," Rabbi Mei says is liable for idolatry. Sanhedrin 61a)
(3) Also I want to defend the thesis of the Rambam [Maimonides] that worship of a mediator is also in the category of idolatry by means of an idea of Reb Chaim from Voloshin [in his book the Nefesh Hachaim]
First the ways of doing idolatry are five. Four are not according to its way: pouring, burning, sacrifice, bowing, and one according to its way. [Sanhedrin 60b].
Second of all, no god needs to be considered to be a world creator..No god ever was. [ For example Zeus was the god of lightning.] [Brahama the creator is himself created by Brahman. And Brahman is not a creator but a former of the world from his own substance.]Even those that were world formers had always found preexisting substance.. The gods were not immortal. The Norse gods could die.
To be considered a god all one needed was power over some aspect of the world like healing or giving birth to children etc.
So it seems possible to say that coming to a navi [prophet] for a blessing could be in this category. All one needs to do is to think that he has some kind of spiritual power over some aspect of the world like giving blessings for children or healing. And then doing the service that is special for him as perhaps in giving to him charity.
Yet we do find in the Torah people coming to a navi (prophet) for blessings. Avimelech was commanded by God to go to Avraham and ask him for a prayer.
It looks that the Torah is thinking that a mediator is OK. If one thinks the being has powers in himself that is idolatry but if he is only a pipeline to God that is OK.
This presents a problem to the Rambam who says a mediator is also idolatry.
The answer to this is in the Nefesh HaChaim by the disciple of the Geon from Villna. He considers that when a person attaches himself to the divine spirit in a tzadik that is idolatry. This is how the Rambam would answer our objection that when the Torah says to go to a Navi or prophet for blessing it does not mean that one attaches himself to the spirit of that prophet. That is that the idea of idolatry is a kind of spiritual connection with some being besides God.
The other people besides the Rambam that do not seem to think that a mediator is a problem are thinking of idolatry more along the lines of the Talmud itself that is means accepting some being as ones god.
I think there is no chance that older Hasidim will change their world view. I think they will continue in older theology in which the tzadik is the central figure. But every day new people get involved in Chasidut and my hope is they they will understand that a tzadik is not the central aspect of Torah, but rather God.