Question: 2. Do I Have to Change Religions to Chant?
Answer: No. You can keep practicing whatever religion brings you joy. Just remember that when you chant to the Gohonzon that it is NOT a GOD. The Gohonzon is your own life, so don't beg when you chant. When you chant to the Gohonzon you are declaring what you want.
Response: Follow Jamie or those like her and you will fall into the lower worlds of existence as sure as an arrow aimed at the earth can never miss the target.