Islam does not draw a sharp line between belief in God and belief in Islam. Many people are confused over the meaning of disbeliever as anyone who is not Muslim.

Hindu says anyone who does not believe in any form of God is atheist. At one point Hindu philosophy says that no one can be disbeliever or atheist arguing 'As everyone seeks happiness, everyone accepts presence of happiness and hence that of God given that God and happiness are synonyms.'

Infinity cannot be limited yet Islam impose some limitations on God like 'God cannot be in any visible form'. In fact God is all powerful and when powerless soul can assume form, it would be irony to conceive that God cannot assume any form. It is agreeable that God does not have any form as stated in Islam but that is only one of the infinite options. It does not mean that God cannot exist by any other form.

The treatment of disbeliever: Islam almost advises killings of disbelievers and whole terrorism is its outcome. Hindu says disbelievers should be ignored. The reason is mind is attached by both the ways. Love and hatred, Friendship and enmity. Detachment is must to seek God. Thus you will never succeed in pleasing God by killing others out of hatred. Hence no religious support for Terrorism.

Of course you have right to defend. Killings in such cases and in war and killing as a punishment is allowed but in case such killing is ordered on false pretext, there would severe divine punishment as murder is considered as one of five great sins. When Karn said to Krishn, 'It is injustice to kill me as I am not having weapon in my hand.' Krishn replied, 'It is justice to kill perpetrator of injustice through unjustified manner.' Lets us take a look where you would end up.