Without Agape there is no Christianity. Those who speak about Christianism without Agape are not Christians but something else. Agape is the most pure Christian love. It's the love for God through people and the love for people through God, unconditionally. Through such love one becomes able to recognize themselves through others, so being able to love themselves where they find God. In other words, It's to find God inside yourself through empathy and consequently you will find god in others. This is basically Jesus' message and it's not about religion but about psychology,
Neuroscientists and Psychoanalysts, such as Stuart Brown and Winnicott, discovered the relation between play and empathy. In short, it means that the more time we spend interacting with others in a relaxed manner and for no reason at all (playing and art), specially during our brain development while we are growing up, the more we become empathic, which means the ability to see oneself in others' situation as their own situation (being able to recognize themselves in others).
True empathy has no utilitarian meaning, the empathic person is not looking for any reward or gratification from their empathic act, other than feeling happy with themselves for acting towards other people, as if they are acting towards the self which they find in others' shoes. Jesus literally interpreted it as the unconditional love, which in order to have one has to find God in themselves, the security against their own fears.
If we mistake Agape for Philia, which is the love for oneself only - and not for God - for utilitarian relations (also known as fraternal love), such Christianism is not the one that comes from Jesus but from the Church as institution, that emerged inside the Roman's patriarch tradition and proto-capitalist culture.
The opposite of Philia (as well as Agape) is Fobia, the obsessive fear of what one believes to be a constant threat or danger. Those who have Phobia can not find God in themselves, so they feel on their own with their tragic fates. By not finding God inside themselves they are not able to find god inside others who they consider as a threat, thereon not being able to have empathy, they tend to become cynic. Therefore, not being able to love God through people and love people through God.
It is also not Christianism if Agape get mistaken as Storge, the instinctive love for your family and those considered as the same and so belonging to a family. Even less Christian is it is confused with Eros, the carnal or erotic love.
Maybe because the Jewish spent so long in the desert without a land of their own, they believed they were being punished by God. Jesus, who was a Jewish, came up with another interpretation about God; A God of love and not a God of fear. Jesus had a libertarian preach from both Jewish and Roman moral laws that became strong in their social crisis, so he ended up crucified by both. But Jesus wasn't alone in his view about conservative traditions because Greek tragedies also taught people about the dangers of rationalism (born with Socrates), its individualism and moral traditions that attempt to control nature out of fear. Greek tragedies tell us that nature and its mysteries can not be controlled, it has its natural symbiosis which we can not fully understand, so we can not escape our fate that is part of such symbiosis. But Jesus had a positive love message, about how we can find comfort in each other despite our fate; Such love is literally God. Once Christianity is institutionalized under Roman economic, political and military brotherhood tradition (Philia) and rationalism (under wish was born the self-consciousness and consequently the responsibility of each one for their own fate), Agape in Christianity became faded and mistaken with another kind of love; A materialist love.
Jesus' message has a lot in common with oriental metaphysical religiosity. For this reason some people speculate that Jesus may have traveled in East Orient where he might have learned the bases for his message. I don't know about it, but I prefer to believe that Jesus was just a guy who had a metaphysical experience and interpreted such experience in the monotheist language of his religious tradition, as Alan Watts suggested. Especially because Jesus wasn't the only one who by intuition could feel and understand something beyond common understanding during his time and culture. Think about Greek philosophers and mythologies, Taoist monks or even Spinoza and Einstein in a more recent historical times. Many centuries later (or few years later if considering the modern thinkers) a lot of what they realized by intuition became accepted by rationalism and in many cases confirmed by empiricism.
If one has fear and they are not able to recognize such fear in themselves - especially because they want to be tough or fit in a group in order to have the social belonging feeling (Spinoza and Homeostasis) - , such fear turns into hate. In order to not hate themselves (for feeling weak or vulnerable) they tend to transfer such hate towards outside themselves, towards others. Without realizing, hate becomes a self-victimization; A product of fear of what they find in themselves.