That different situations. 500 years ago catholic church try keep control under all people, Now Islamic terrorists are try to scare surrounding people and say all other religions: they must gone for ever.

Religion it is the strongest drug. People will always kill others with God name on the mouth.

The simplest way put atom weapon on Earth. Kill all life on, and will be piece forever.

It isn't simple it is easy If God don't exist it mean scientists can do everything they will do but If God exist????

and we all can feel better

Everything looks easy as long we thinking theoretically, but question is how we (humanity) will travel that fast without seed enough star ships??

Yes, to days users don't need speed, low energy consumption and miniaturization it is a most important goal.

People always has a short memory, and they know about them. So as long we forgive, they will using.