Okay a few points I'd like to input:
I am a Muslim Revert/Convert.
My family are athiest, catholics, prodestants, agnostics quite a mixture..
Islam is complex, has many teachings -
Belief in God/Allah - oneness of God ie that there is only ONE God, who is unlike anything, who created everything, who has knowledge, power, mercy, love etc, but who will also punish
Actions have consequences - my dad who is an athiest said once to me 'hey, I'm a good guy, if there is a God I'm sure I'll be fine I do good in life etc' However in Islam the key component is believing in God - lets face it why will God acknowledge you when you have lived your life denying, belittling him?
Character -
The message in Islam is that you should better yourself, you should have good character you should be careful to improve it etc.
Sins -
God/Allah says in the Quran "O my servants who have wronged themselves, do not despair in the Mercy of Allah" 39:53
Prophet Muhammed said: "I swear by him in whose hands is my soul, if you were a people who did not commit sin, Allah would take you away and replace you with a people who would sin and then seek Allah's forgiveness so he could forgive them" (sahih Muslim 2687)
So it's not about being perfect and free from any taints, it's about showing gratitude to God/Allah and it's about striving to be a better person..
It's about living your life not to deprive others, but to love to share to do good to help people etc.
All with the faith in Allah that he will have mercy on you when you die.
Prophet Muhammed said that Allah says "I am as my servant thinks of me" (Sahih Bukhari 7405) Again, the faith we have in Islam, as Muslims is the faith and trust in Allah that He will have mercy on us, he will guide us through our lives, bless us, etc
it's completely different to 'blind faith' or believing in something without proofs, as God/Allah sent messengers, prophets etc throughout the ages to guide people, they had their proofs, the prophets with their miracles but we believe Muhammed was the seal of the prophets, the last of them, sent to perfect our way of life showing us how to live with good conduct..