First of all, welcome to this group and I think this is exactly where you need to be. Secondly, I think that you should begin to separate religion from faith. Shy, there is no one on this earth that has the power to speak for God and his judgement on your life and your eternal life. This is written in the scriptures they profess to follow. You can't pick and choose. I think you are absolutely right, that God is not that harsh. We are all sinners and have fallen short of his standards. We are also all forgiven if we acknowledge that Christ is our savior and the way to salvation. I don't think changing your "religion" is what will bring you peace. Loosing loved ones and their acceptance and their approval is extremely hard, but consider this... we all have to account for our behavior and actions before God. They are no better than anyone else and because they have shunned you they actually are going against the primary principles of Christianity.... Love your God with all you heart and Do unto others.... you can't do one without the other...
You know what type of person you are and you know your relationships with God is yours, not theirs to know and cherish... Do not leave God because of another man... this would be the greatest mistake.
I too grew up in a very religious family and although my mom has left my "choice" up to God and I have other family members that would prefer not to be around me, I know that I am saved and what they think is irrelevant. Have faith in your faith, not in your religion... my opinion is religion is of man, faith is of God.... which would you rather have?