Aisha,
Can you help me understand something that I don't understand about Islam? I've heard what you just said many times -- that Islam is the last religion, the true religion that God sent to people. If I understand correctly, you believe that God sent the Torah and Injil to help people, but they weren't complete and God didn't guard them from corruption. In contrast, when God sent the Qur'an, God did choose to guard it from corruption, as 15:3 says.

So here's my question, assuming I have understood the Muslim perspective sufficiently. Why didn't God just sent the Qur'an immediately, like to Adam and Hawwah, or even to Musa? Why send incomplete, corruptible scriptures instead of the real thing?