Dear " Jengiove", I wish first to say, that we Muslims call each others brothers and sisters, becasue our faith is one, but we can say for others who are not Muslims, and call them " brothers and sisters in humanity".
Being a Muslim is to belive in Allah like one God,and belive that Mohammed sallahu alayha wa salam is His Last Messanger,and to belive in other Prophets before him which have been sent to guide mankind.
Allah subhan we teala sais: " And I have create man and jins only to worship me", and worshiping to Allah, it does not mean only to belive in existence of God, because Jews, Christians,and even folowers of other religions belive in existence of God,but that does not make them Muslims, neither Mumins( belivers), neither those who worship to Allah. There are two parts of eman or faith, which is consisted in 6 pillars of beliving which means to belive with your heart that there is no other God except Allah, to belive in His angels,to belive in Allahs Messangers,in His Holy Books, to belive in Day of Judgment and on the end to belive that everything is happening with Allahs decission.
It is not righteousness
That ye turn your faces toward East or West;
But it is righteousness -
To believe in Allah (The One and Only God)
And the Last Day
And the Angels
And the Book
And the Messengers;
To spend of your substance out of love for Him
For your kin
For orphans
For the needy
For the wayfarer
For those who ask,
And for the ransom of slaves;
To be steadfast in prayer
And practice regular charity;
To fulfil the contracts which ye have made;
And to be firm and patient in pain (or suffering) and adversity
And throughout all periods of panic.
Such are the people of truth the Allah-fearing (God-conscious).Quran ( Surah Al baqarah, ayah 177)
And other part of eman is to testify everything this with your deeds, which means to practise Islaam by 5 pillars of Islaam, how our beloved Prophet sallahu alayha wa salam thought us,and to stay away from mayor sins, which are cousing dissobidiance towerd Allah, because beliver is the one who is trying to please Allah with his deeds, words and actions,and if you reed Quran, you will reed Inshallah that Allah is mentioning so much times the characteristics of belivers, while others who are not submitting to Him by thier deeds are called big sinners for thier deeds,or from other side some are called kaffirs ( unbelivers) who do not belive in Allah at all,and who are going against Allahs law.
And also to note, that our Prophet sallahu alayha wa salam never said that praying five times a day make one to be Muslim, because Islaam is religion which is based on Quraan and Sunnah,and it can not be taken only from one haadith or one ayah, but it needs to be learnt with pure heart and niyah,and it needs to be learnt completely from Quran and Sunnah, without taking one parts of Islaam,and leaving others. Maybe you have meant on the hadith which have ben narrated in the famous haadith from Umar Ibn Al- Hattab when , Jibril a.s., asked the Prophet: Mohammed, tell me what is Islam?, He said: Islam is to testify there there is not God except Allah, that Mohammed is Allahs Servent and Messanger,that you pray salah, that you fast the month of Ramadhan, that you pay zakah,and that you preform Hajj if you are in ability."
As Allah Almighty aslo sais:Qur'an 33:35
Lo! men who surrender unto Allah, and women who surrender,
And men who believe and women who believe,
And men who obey and women who obey,
And men who speak the truth and women who speak the truth,
And men who persevere (in righteousness) and women who persevere,
And men who are humble and women who are humble,
And men who give alms and women who give alms,
And men who fast and women who fast,
And men who guard their modesty and women who guard (their modesty),
And men who remember Allah much and women who remember--
Allah hath prepared for them forgiveness and a vast reward.Qur'an Surah 33:,ayah )35
As other brothers and sisters replied above, you can not be Muslim, untill you do not folow Quraan and Sunnah, or you can be Muslim only by name or your own belifs. But Allah knows the best what is in your heart,and how are your intentions, so if your intentions are pure Allah will guide you to Islaam,and make you Muslim too.
I hope Inshallah that our posts will be benifical and usefull for you,and that Allah will guide your heart.ameen summa ameen
May Allah guide you:tti_sister: