I am new to this forum, so please forgive my comment for being four years late.
Some observations which may help: my understanding (from Catholicism) of the Trinity, is that it embodies the idea of relationship in the godhead itself, as the nature of God is essentially love. The Trinity also encompasses the understanding that God is both transcendent and imminent. The Father (or Mother, it doesn't have to be gender specific) is the transcendent source, which is unknowable to human understanding. The Son, the logos or word of God, is the outpouring of God's loving energy into creation. The Holy Spirit is the divinely created spark within us which shows us the way to truth. God is one, but one in three. This is a divine mystery, which we can never expect to comprehend fully through rational though.
Jesus is understood to be the human incarnation of the logos, the word become flesh. The idea here is that the world is fallen and we have lost our full unity with God. God reaches out to us, out of love, to fully participate in our bodily humanity. This is at the heart of the idea of theosis - God became human so that humans may become God. From this viewpoint, saying none are saved except through Jesus really means that we can all be united with God through God's loving participation in our humanity.
On the question of free will, God gives us this freedom because he wants us to have the capacity to love him freely. Without this, we would merely be puppets, and not created in the divine image. Our free will means we also have the capacity to choose to reject God's love. That is the risk God takes for our freedom, and is where the idea of hell comes in. Hell is defined as separation from God. Only we can choose that, by choosing to love what is not God, which is what 'sin' means.
Do I like Christianity? I'd probably be more comfortable being a Sikh, personally, as it seems to me less problematic. Christianity is riddled with distortions, such as literalism and biblical fundamentalism, which make it hard to sympathise with. It also has a long established, genuine mystical spirituality at its core, which seems to me to be essentially similar to the Sikh religion. I hope that helps!