Imo you can't ban religion or anything for that matter. If you try to ban things, especially a value system, you cause conflict, repression and give something great significance. Things go underground. You can outgrow things or educate though. Thats what politicians try to do: Ban things. Because they don't know a solution they make a law, a consequence for your actions. They have no understanding in the field of human behaviour to truly solve anything. Its why the drug wars, stopping violence, the law systems are all a big fat failure.
If i could change one thing it would be the current monetary system. We are 1 planet, 1 human family, that require all the same needs. Beyond religion,beliefs,opinions,national divisions and artificial boundaries which we differ, we all have the same needs and promotion of positive health that can be met very easily.It is through the means of science and technology, related to the capacity of the earth(Science and technology aligned with nature). The fact is if we consume more trees faster then they can grow, we run out of resources, we all end up suffering regardless of what we both believe.
One example is we can cut back about 99% of landmass used by current agricultural farming. The method is a vertical tower, which can make fruits and vegetables all year around,100% organic with no need for pesticides and the like.It is totally automated. These can popped locally in towns, so there is no need for trucks travelling 1000s of kms. One of these towers can easily feed about 10000 people. This is just a very short, 1 of a 1000 examples of what we can truly accomplish if we put our minds together to use our technology efficiently, although people are not aware it exists. I will stop there.