Evolution does not explain the origin of life. It explains how life developed over time. Evolution has nothing to say about the existence or nonexistence of God or any other supernatural being. A large proportion of scientists, including evolutionary scientists, believe in Christianity or another religion.
Intelligent design is a variety of the pseudoscience of creationism, which was created by Christian fundamentalists.
The Christian doctrine of creation, as understood by mainstream Christians, teaches that God created and sustains the universe. It does not specify whether the original creation was accomplished by divine creation (creation ex nihlo), the Big Bang, or by another means.
Fundamentalists believe that the Bible is inherently and infallibly true. They fear that if any aspect of the Bible is not "literally true" (that it doesn't mean what they interpret it to mean), then the salvation promised by Jesus was a lie.
This extreme belief, coupled with general knowledge of science, has led fundamentalists to create a set of beliefs to rationalize their interpretation of the Bible with their knowledge of science. That set of pseudoscientific beliefs has evolved from creationism to scientific creationism, to intelligent design.
By far, the large majority of Christians do not link the factual correctness of the Bible to the spiritual truths it reveals and the promise of salvation made by Jesus.
Thus, by a wide margin, most Christians believe in the doctrine of creation, but do not believe in the pseudoscience of creationism, whatever name it goes by.
Panspermia is the belief that living spores float around the cosmos, fluttered down to earth, and sprouted. A very small minority of scientists believe this. They do not have evidence to support their belief, thus, it could be considered a religious or philosophical belief, but not a scientific theory. Anyway, the spores would have evolved to produce the life we now observe.