You see that's really idiotic. You canot have a discussion with such stupidity claims. I just told you that this is a concept of shiism. Not a concept of Islam.
A believer cannot lie. The only concept of permissibility in lying in Islam is if your life is in danger. That you say something to avoid death and white lies such as telling your wife unrealistic things such as you are my soul when literally she is not your soul but it is out of love to exagerate or another concept, to make peace between two brothers, to say hey i heard your brother say *insert something good* and vice versa to the other.
We do not conceal what we believe. Shias do because again as I said their corrupted beliefs that contradict islam. They literally pray to dead people and ask of them supplications. This is shirk/partnership/idolatry in islam. They lie about these kinds of beliefs and practices. Their practices if you see them look frickin pagan even. Crawling towards graves, crying to dead people. Wth? This is not islam... and they try to lie to other muslims that they don't do such a things.
Islam is not about secrecy its about delivering the message and upholding the truth.
The fact that I openly talk about what you even dislike such as punishments for adultery, theft, etc.. I have nothing to hide, I will say it as it is. Lying only begets lying.
Truth stands out clear from Error (Qur'an 2:256)