Pasting for Octavia since theres a bug in the system.
"you have no idea where you came from, you don't know where you're going when you die and that to me seems hopeless. By hopeless it means that you have nothing to look forward too. You will simply do you're 70-80-90 years on earth and walk out into the unknown. What is the purpose of even contributing to life: going to school, getting a job, living day in and day out, going through pain and suffering, good days and bad days if you have nothing to look forward too? Doesn't very well seem worth it to me. That to me is "cruel". Being a conscious person that has to go through this often unbearable life and then die. Why would I even bother to grind it out?"
None of what you said proves God exists. None of what you said proves Christianity is true. What you did was make a logical fallacy called an appeal to consequences. "If there is no God, then life is meaningless. I don't want life to be meaningless. Therefore, God must exist." It's faulty reasoning, and it says that if something (like no afterlife or god) is depressing, then it must be false. Something that is true is true even if it makes you feel uncomfortable, and something that is false is false even if it makes you feel comfortable. Are you saying you want to believe something that makes you feel comfortable and happy, even if it isn't supported by any evidence? That's what it sounds like.
The other problem with your argument is the assumption that life only has meaning if it lasts forever. If this life is all there is, that gives it even more value, because it's a rarity, something to be treasured and cherished. I believe this life is all there is, and I don't find that depressing or hopeless at all. I'm sorry if you would. I'm sorry if the ephemerality of life brings you discouragement. I enjoy every day. I enjoy nature, music, laughter, friends and family, and learning. My atheism does nothing to diminish my joy, and I can't understand why some people think it would.