Government welfare programs are centrist, they were established in my country by a left-right alliance after the WWII… Jesus advocated something more radical : if you have something that you don't need, it's not yours anymore, it's something you have to give to people who need what you have. It's basically the end of private property, and not only of the means of production.
But no, he was not violent, that's true. Is violence a leftist marker? I don't think so.
In France for example, there is a transition period between 16 and 18 were teenagers are sexually adults, but if actual adults have sex with them it's still considered like a kind of rape, even if the teenager is willing (I'm simplifying a lot). Verify the details of your countrie's laws.
I like to compare religions to languages. They are tools to speak about the unspeakable, but they don't necessary oppose each other when they have different doctrines, like French doesn't oppose English when it calls “maison” what English calls “house”.
By definition, God is a reality that exists outside time and space, there's no way our mind can define it. But like you need a language to speak, you need to practice a religion to develop your spirituality, even if you know that your religion is not the only way to develop it. You can also speak more than one language, and you can practice more than one religion, but it's harder.
Perfect death