I am sorry you are experiencing so much distress. Unfortunately, your family may not be able to focus on your issues because they may have too many of their own. That may be why they dismiss you and your concerns. Also, if they are unable to solve their own issues, then they may feel helpless to deal with yours. Having no help or support from your family makes the prospect of tackling your issues doubly difficult. I can understand why you’re overwhelmed.
I have two suggestions for you. One is that you speak to a guidance counselor at school. There are many teenagers in similar situations and they feel that no one at home can help them. Utilize the guidance counseling service at your school, if it is available to you. My second suggestion is to seek guidance from a clergy person. You said that you are Christian. Perhaps there is someone at the church who can assist you with not only the family issues, but also with the fact that you feel distant from God. I would advise you to consider both, speaking to the guidance counselor and a clergyperson.
Not having support from your family can be a barrier to treatment, especially for teenagers. I would encourage you to keep trying to find help from a teacher, a therapist, guidance counselor, mentor, or any other respectable adult whom you like or trust. Don’t stop trying until you find someone who can offer you help. You should also consider joining a school program or extracurricular activity, or any other social gathering or support group. I suggest this because you could benefit from a support system. I believe that if you had friends or a circle of support then you would feel less overwhelmed. It could act as a “buffer” for the stress you feel at home. Ideally, individual or family therapy would be the best type of treatment for you, but if you are unable to access that, a supportive friend or social group could help you considerably.
Thank you for your question and I wish you the best of luck.