Why Hezbollah is an ally of Christians in the Middle East

This seems odd to Westerners even to me. The reason my curiosity is apparent is that most of the world labeled Hezbollah or the Army of God as a terrorist organization. Wait, is that the Iran affiliated group and a Shiite hit squad? They are operating in Lebanon right? But we don't know that they help the Christians in Lebanon repulse the ISIS and also in Syria as of the moment. Most Christians in Lebanon has a positive view of Hezbollah for protecting them from a lot of outside attacks.

I would make to make a reference from this website(http://www.christianpost.com/news/they-accept-us-as-we-are-christians-join-forces-with-muslim-group-hezbollah-to-fight-isis-in-lebanon-138975/):

1. The Iran-backed Shiite Muslim militant group Hezbollah, classified for many years by U.S. Intelligence as a terrorist organization, is training Christians to fight ISIS in Lebanon and the Middle Eastern believers say their new and unlikely allies "accept us as we are."

2. Rifit Nasrallah, a Catholic businessman who is part of the militias fighting ISIS in Ras Baalbek, discussed the alliance with Hezbollah in an International Business Times report last month.

"We're in a very dangerous situation," he said. "The only people who are protecting us are the resistance of Hezbollah. The only one standing with the army is Hezbollah. Let's not hide it anymore." Nasrallah said Hezbollah does not expect its allies to convert to Islam or create an allegiance to the group's ideals. "They accept us as we are," he said. "They do not impose on us anything. When there's an occasion, they come to our children's birthdays. The people here accept that Hezbollah comes and helps.

And it's a different story than what I heard few years ago. Speaking of Islam, Hezbollah which is a Shiite Muslim militant group or tolerant of other religions or ethnic groups which the Western media wouldn't even try to portray since just because they are Muslim means there is a negative connotations...right? When Coptic Orthodox Egyptians who are hostages were killed, Hassan Nasrallah said ISIS were  inhumane and savages. You won't hear those from typical Sunni Imams because they support the Saudi regime, Barack Hussein Obama's secret war against Christians, Shiite Muslims, Jews, and minorities that either are not Sunnis or Sunnis that never give themselves to the ISIS yoke.