I had some similar experiences, I had experienced LSD in my college which made me question most of the religious beliefs, I cannot say I'm an agnostic, as in Hinduism I have found most of the answers. 
I feel the baseline is similar in all the religious beliefs and that if what you have specified in your post.
But still I think there is something deeper into it. We don't know why we exist, why only our planet has life, why are we here? I think answers to all those question cannot be answered till you visit and explore the spiritual side.
I believe in Karma and have seen that my life was decided before my birth. I regularly look into vedic astrology also, which I think is a beautiful science. If you are completed try researching in vedic astrology may be it could help you know your path, and answers your question.