JC isn’t the messiah for me (a conservative Jew) for the same reason he is the messiah for you...FAITH.
***Jesus was the messiah or he wasn’t. His claim to be (not only messiah, but) equal with God is the real stumbling block. Once you’re confronted with the historicity, the factual evidence of the claim, there is very little faith required. Either He was God, or he was a liar or a lunatic. You can withdraw away and choose not to be confronted by the facts in front of you, but calling such an action ‘faith’ is an error.
Is Jesus looked at as Someone heretical? Not until they are confronted with the historical fact that Jesus claimed to be God Himself. At that point, every jew I have spoken with has doubted the historicity of the claim, even though the enemies of Christ acknowledged (and used) it at the time of His death. At this point, I would suggest that you’re at the point of doubting the historicity of the claim. You can’t go before God and claim you never heard this. It is worth checking into, for the sake of your own soul.
“Is Jesus looked at as Someone heretical?”
Yes, of course. That is why the Pharisees were upset with him. He was not teaching pure Torah.
At one point Christ asks it of each one of us, Jew and Gentile.
"Who do you say that I am ?"
When Jesus came to the region of Caesarea Philippi, he asked his disciples, "Who do people say the Son of Man is?"
They replied, "Some say John the Baptist; others say Elijah; and still others, Jeremiah or one of the prophets."
"But what about you?" he asked. "Who do you say that I am?"
(This is the most important question we are ever asked and the most important question we can ever answer.)
Simon Peter answered, "You are the Christ, the Son of the Living God."
(Matthew 16:13-16, NIV)