Pharmer, a worldly here. Let's call a spade a spade (and if Spade adds a post of his, you will meet another active apologist of the Watchtower on this site, besides DJEggnog). Your question is very easy for someone who's not indoctrinated. It reads to me as "If I read that 2 + 2 = 4, and the Watchtower says it's 5, who should I believe, logic or the Watchtower?" The answer CANNOT be "logic", because then you're not tied to anything the Watchtower says. The answer CANNOT be "the Watchtower", either, because then you would see what the organization really is, and that shouldn't happen. Your friend may be trying to indoctrinate you and he doesn't want to say something that would scare you away.
The long answers by DJ Eggnog are indicative of how difficult answering this question really is, and that is because the RIGHT answer is the "wrong" answer in the Watchtower world.
Have you heard the joke about the engineer, the doctor, and the accountant who were asked "a simple question": 2 + 2 = ?
The engineer: "With reasonable accuracy and exactness, I am confident to say that the answer is a number between 4.01 and 3.99".
The doctor: "nothing is ever exact in the natural sciences, but the answer should generally be 4"
The accountant (speaking in a low voice, and with a smile on his face): "How much do you want it to be?"
Can you guess what the answer would be if asked from an active witness?