Assalam 'Alaikum Warahmatullahi Wabarakatuh
Welcome to the family sister.
Allah has send one religion, not many.
Adam, Noah, Abraham, Moses, Jesus, Muhammad etc etc etc (peace be upon them all) were sent with the same religion which is "Submission to Allah" (Islam). They all called the world to worship Allah alone, and not to associate any partner with Him.
Allah sent revelations to His messengers. There has been 313 Rasools (messengers with whom Allah sent a new Shari'ah) and 124,000 Nabis (messengers by whom Allah spread the message of the previous revelation of Him). The figures above are known from Saheeh (Authentic) Ahadeeth (Plural of Hadith).
However, the people of that time has changed the previous scriptures by their own hands. Allah says in Surah al-Baqarah, Verse 79, about what the people of previous nations has done. He says,
"So woe to those who write the "scripture" with their own hands, then say, "This is from Allah," in order to exchange it for a small price. Woe to them for what their hands have written and woe to them for what they earn."
Thus Allah sent His last and final revelation, the Noble Quran which He assured to prevent from any corruption. In Surah al-'Hijr, Verse 9, Allah says,
"We have, without doubt, sent down the Message; and We will assuredly guard it (from corruption)."
Hope it helps inshaAllah!
Wassalam 'Alaikum Warahmatullahi Wabarakatuh