Holly,
Your reasoning on the Trinity sounds very good. I belive you have sound reasons for not beliving in the Trinity. Now continue to reason the same way with EVERY doctrine that the society presents to you. Maybe start with proving to yourself that the 607 BCE date is correct. Maybe prove to yourself that birthdays are wrong, and that you will die a horrible death just for celebrating them. Fully explain to yourself why it is very wrong to celebrate christmas. Be sure to include everything. Be sure to note all the proper scriptures that support the whole disfellowshiping process, so that when the time comes, and your family is divided, you know exactly why, and support it 100%.
Dont read this sarcasticaly, I mean NO disrespect. I am just trying to help.
~cab