"faith" and belief in the almighty and his designs are interlinked with righteous deeds. The more you do righteous deeds, the more your faith grows. The more you believe but do not do. The more your faith and belief suffers. Such is human nature and hence the reason for doing righteous deeds. They enforce your faith.

This is why the Prophet (sws) has re-enforced this several times:

“The best among you are those who are morally sound from others.”
“These are the people who are very dear to me.”
“On the Day of Judgement, it will be high moral behaviour which will carry most weight in the scales of a person.”
“A believer achieves the same rank through high moral behaviour as can be achieved through fasts and the night prayers.”

"Indeed this Qur’an gives guidance to the path which is the most upright and gives glad tidings of a great reward to those among its believers who do good deeds." (17:9)

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