What did the Crow Indian warriors were in battle?

they were very religeous

Answer: It would take a whole book to explain in detail all the religious beliefs of the Absaalooke or Crow people. In Robert H. Lowie's book "The Crow Indians", he explains just a few beliefs by quoting several Crow stories about vision-quests, gifts and powers supplied by supernatural beings; and shamanistic healing of sick and wounded tribes-people.

The Crows recognised a wide range of spirit-beings who could either help people or not (depending on circumstances), including the Sun, Morning Star, High Thunder, the Thunderbird, the Seven Stars, dwarf spirits, buffalo, snake and chicken-hawk spirits, Eagle and Old Man Coyote. Of the these, the Sun was perhaps a supreme "god", but another spirit was considered to be the creator of all things: Akba'tat-di'a (the Maker of Everything) - in that sense he was equivalent to the Christian God.

Anyone could attempt to seek a vision of one or more spirits, usually by going to some remote, high mountain and neither eating or drinking until a vision came. This might include a warning about the future, or reveal magical items that would protect the person from harm (a special song, a dance, war-paint, the feathers or skin of a particular bird or animal, and so on).

Spirits could appear in any form they chose, so (for example) Old Man Coyote might appear in the form of an eagle, a bear or wolf who could speak to a person and give advice.

There is much more, but this should give you a taste of Crow beliefs.