Those who reject Allah and hinder (men) from the Path of Allah- their deeds will Allah render astray (from their mark).
But those who believe and work deeds of righteousness, and believe in the (Revelation) sent down to Muhammad- for it is the Truth from their Lord- He will remove from them their ills and improve their condition.
[Qur'an 47:1-2]

It is narrated on the authority of Anas(RA) that the Messenger of Allah (may peace be upon him) said on the day of the Battle of Ubud: O Allah, if Thou wilt (defeat muslims), there will be none on the earth to worship Thee.