Scientifically speaking, there is no proof for the existence of God yet so don't blame him when you are not good.
while i believe in God but i agree on your point because there are too many religions and also others that don't believe in God that has different beliefs so pointing God specifically is an argument so i think we can take it out from the topic since some arguments are believable .
If you are afraid of all the things which might happens lack of love and care from someone which made you depressed mentally.
i think what is appropriate sentence to use here is "Dont do unto others what you dont want others do unto you" because if can only give respect to everyone i believe this topic don't need attention.
Remember one major point about "doing unto others." And you are right when you use the word "don't" rather than the word "do." While we are all the same in the fact that we need air to breathe, water to drink, food to eat, and other people for good relationships, we are still different in many ways.
The point is, look for the differences in the mindset of others, so that you know what to do to/with them. After all, you might think differently than they do, and the things that you want done to you might not be what they want done to them. So, find out what they want done to themselves, so that you know how to treat them as they want. Hopefully they will do the same kind of thing for you.