While this might be true in theory, I have not found it true in practice. I am no longer religious and I have not attended church for 20+ years, but despite trying many of these secular 'alternatives' to church I have yet to find anything as open, welcoming and socially supportive as I found church.
edit: Yes, I know this isn't everybody's experience, and yes some churches can be extremely bigoted, exclusionary and downright evil to people they perceive as 'others'.