lingam means symbol, in sankrit!! not a sexual organ..oops how can i expect a muslim to know that....
let me accept the followers of tantra do think lingam means sexual organ, but it is not mainstream Hinduism, most of the Hidnus follow Vedas, so Shiva lingam means symbol of Lord Shiva, can you desribe the form of shiva linga , nope it is not a circle, it is not a square..it is a form beyond your comprehension, a undecribable symbol to undescribable GOD ( if he exists)...
hope it helps, dear moahmemd or hesus..
let me add , what caused your creation, not those linga yoni, think abt it , it is better to pray to those organs which cause you, than to ALLh who comamnds moahmemd to marry a 6 year old ayesha..what do you think..