Biologists are individual human beings. A few very vocal ones have been openly hostile to religion. This would be true of any profession from plumber to bishop.
Biologist in general follow the precepts of Isaac Newton, and look for regular phenomena and natural causes. Science neither denies nor invokes God.
let's establish some things we can all agree upon:
1. scientists can't prove or disprove the existence of God
2. believers in God can't prove there is a God, that's why they call themselves 'believers'
3. the theory of evolution isn't concerned with the existence of a God. that idea is outside of its scope.