When Ezekiel was taken in vision to see the idolatry in the temple he was truly incensed. There were many disgraceful and detestable things being done there. Tammuz was worshiped as a Phoenician sun god, the husband of Ishtar (from where the name Easter originated)– one of the goddess of fertility and sex. The weeping for Tammuz was for an annual lamentation over his death and later a celebration of his “resurrection”. His death was to typify the long dry summer and his return to life is symbolized in the new life of spring. It was because of all of the detestable practices being done in the temple in Jerusalem that the glory of the Lord left the temple.

Ezek 11:12
And you will know that I am the LORD, for you have not followed my decrees or kept my laws but have conformed to the standards of the nations around you."

Again God reminds them about conforming to the standards of the nations.

God calls us as Christians to be different from the standards of the world. He calls us to be transformed.

Rom 12:2
Do not conform any longer to the pattern of this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what God's will is-- his good, pleasing and perfect will.

Ezek 11:23
The glory of the LORD went up from within the city and stopped above the mountain east of it.

The mountain east of Jerusalem is the Mount of Olives. It is here that the glory of the Lord departed and it is at this same place that Jesus will return.