I'd like to recommend creating a account so me or other members can assist you, as guest have limitations in replying here and if we need further Information to communicate with you.
If you hold the power button down until it restarts, and it restarts in download mode (what you call Odin mode), you have no Android in the phone (also all your data, texts, music, etc., are gone). You'll have to reflash the ROM. See [Samsung] How to flash Stock ROM via ODIN.