It is up to the person making the positive assertion to prove their case. You are as bad as a Christian that thinks he is right if you can't "prove him wrong".
The only reason I did not make a case is because I wanted this to be for all religions, since I cannot assume which religion the reader believes in, which makes it hard for me to make a case for all the religions. Anyway since you insist, I will try to make something small about all of them.
I do not see any point why if there is a God he would come to our world and tell us to be good and love and worship him. When I think of God, I think of someone with great power, which can do anything that he want with a snap of a finger, since he created the universe. In most religions, I see God coming in a form of a man, and struggling. If he wants us to know about him, I think that it could be easier than for example Jesus Christ, having to live 30 years as a man, do many good things to bad people, get tortured and killed, and then come back to life. Another example of how I question religion is, imagine if you are a God, imagine you are playing sims, would you go and as a man and tell your people "Hey I am a good person and I love you all. Be good and love me". I do not think that if God is so great, that someone else overcome him to make a "Hell" for the bad people. For me religion seems like a strategy of controlling people. Tell your people to be good so that they can enjoy a perfect afterlife or if they are bad they will burn in fire. I can list many more things but I will take it a bit slow.