@Ben Avraham - even if I prove that the Lord Jesus Christ is the promised Messiah, you should must have faith to be a Christian. It would take time, take some baby steps. You have been a Jew for quite sometime now so please take your time.
The Lord Jesus Christ was a Jew. He founded a church. It was in accordance with the new covenant - written down by the prophet Jeremiah
Jeremiah 31:31-32 New International Version (NIV)
“The days are coming,” declares the Lord,
“when
I will make a new covenant
with the people of Israel
and with the people of Judah.
It will not be like the covenant
I made with their ancestors
when I took them by the hand
to lead them out of Egypt,
because they broke my covenant,
though I was a husband to them,”
declares the Lord.
So it was not like the covenant which God made with the ancient Israelite - it is different. Very different - it required the Lord Jesus to be the mediator of the new covenant as we can read in:
Hebrews 9:15 New International Version (NIV)
For this reason
Christ is the mediator of a new covenant, that those who are called may receive the promised eternal inheritance—now that
he has died as a ransom to set them free from the sins committed under the first covenant.
Judaism is still using the old covenant - the promise land is the New Jerusalem not Israel with Tel Aviv as capital. It is something better.
I recommend that you read the Book of John - for starters to understand who the Lord Jesus is. I'm sure you could get hold of a new testament bible and then ask yourself - Could it be true? Could he be the Messiah? Could it be that Judaism is now obsolete because of the new covenant?
Hebrews 8:6-13 New International Version (NIV)
But in fact the ministry Jesus has received is as superior to theirs as the covenant of which he is mediator is superior to the old one, since
the new covenant is established on better promises.
For if there had been nothing wrong with that first covenant, no place would have been sought for another. But God found fault with the people and said:
“The days are coming, declares the Lord,
when I will make a new covenant
with the people of Israel
and with the people of Judah.
It will not be like the covenant
I made with their ancestors
when I took them by the hand
to lead them out of Egypt,
because they did not remain faithful to my covenant,
and
I turned away from them,
declares the Lord.
This is the covenant I will establish with the people of Israel
after that time, declares the Lord.
I will put my laws in their minds
and write them on their hearts.
I will be their God,
and they will be my people.
No longer will they teach their neighbor,
or say to one another, ‘Know the Lord,’
because they will all know me,
from the least of them to the greatest.
For I will forgive their wickedness
and will remember their sins no more.”
By calling this covenant “new,” he has made the first one obsolete; and what is obsolete and outdated will soon disappear.