Sofia, for me mainline Christianity has been very satisfying. If you go with a liberal church it's nothing like being a witness. But if you want to try other religions, here is my glib little assessment of each :).
judaism-good choice if Jesus is the one you have a problem with.
Hinduism-like Greek mythology, but people today still actually believe it's true.
islam-way too much like being a witness.
Buddhism-this is the one you may really want to look into. If the spiritual side doesn't appeal to you, the philosophical side probably will. Many people who have troubles with Christianity have found fulfillment with Buddhism or secular Buddhism.
atheism/agnosticism-many people make peace with their belief that there isn't or probably isn't a God. They can still have a sort of spirituality/spiritual experiences in everyday joys and a sort of holistic approach to life and as mentioned above, wonder at the world through science.
wicca and similar-these spiritualities celebrate nature and natural cycles. witch broom not required.