Aineo-
My statement is far from false. Many do still practice them and by you standing for the trinity doctrine, you would fall into this category which is why you wish it were false. Now there may be some that don't, but that does not make my statement false. But rather, just not applicable to every denomination. Give me one scripture where it says there are three gods in one. None says that, but men surely love to use their imagination to create something that is not said.
NOt sure what you mean by obtain the will of God, but a person can surely do His will. Otherwise He would not have gave us commandments or a way of life to live. Being as though He does not give us anything we cannot handle, it is evident that one can do what GOd wants them to do.
Now as far as perfect, none can be perfect. If you never sin again, you still will not be perfect b/c you already have. I agree no one can be perfect, but if you think you cannot do God's will, I feel sorry for you brother.