As Salamu 'Alaykum,
Luis, you are greatly appreciate by me because your questions give me the opportunity, motivation, and direction to further investigate the various areas of Muslim Life.
I also see that you are a sincere person with an excellent mind.
On a forum, when you ask a question that deals with "Why?" often the respondents will answer with the reason that they feel is sufficient; however, there may be several reasons.
I think the further away from the time of Muhammad that passes the harder the "Why questions" become.
Allah made males and females complimentary. They are naturally suited for each other and necessarily, if not opposites, at least different. One of the ways society (civilizations) has been harmed is by transvestites, homosexuals, intentional androgynous individuals, etc.
So, Hijab (clothing), hair length, and beards also are part of an individuals gender identity. And, this is also a reason for beards.
During the time of the revelation of Al Qur'an, a major violation of Allah's Will was Shirk (false worship). So, consequently, emphasis in Islam is placed on correct worship. Since Adam and Eve, obedience to Allah has been the purpose of Islam. All creation naturally acknowledges Allah. Allah's exclusive Divinity and worship of Him is natural. Islam is our Deen' (total lifestyle). Our belief in Allah and Tawheed infuses every aspect of our lives. Islam is the only Monotheistic Ibrahimic (Abrahamic) Religion which preaches pure and unadulterated monotheism that tolerates no compromises with nationalism, racism, trinitarianism, idolatry, binitarianism, polytheism, saint-worship, veneration of images or priesthood, etc.
Tawheed is fidelity to Allah and Allah alone. The Shahada is the first pillar of Islam.
ʾašhadu ʾan laa ilāha illa (A)llāh, wa ʾašhadu ʾanna Muḥammada(n) rasūlo (A)llāh
I testify there is no God other than Allah, He alone is God, and that Muhammad is The Prophet of Allah.
Rebellion, false worship, hypocrisy, deviation and innovation and perversion of the natural submission to Allah has always been the test of life for humans.
Everything a Muslim/Muslimah does in his/her life is to live peaceably and in submission to Allah. The most important aspect of the outward manifestations of Islam are our intentions.
There is a void within Man when the natural expression of our body, mind, heart, soul, spirit is pervert from Islam.
An excellent book is The Book of Tawheed (Oneness of All'ah) and UNDERSTANDING ISLAM by Jerald F. Dirks.
There are several excellent videos by Sheik Yusuf Estes and others available on the web. I feel so very blessed to live in a time when access to so much knowledge is available to us literally from around the world at our fingertips.
With your sincere search of Islam, I hope you are blessed by its' comfort, strength, and purity.
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My adopted mother taught me that people don't care how much you know until they know how much you care.
We all care about you and hope you submit to Allah and join the fastest growing religion community in North America.
Subhan'Allah! Alhamdulillah!