Quite sadly, baptism has become a source of great division within Christ's church. Multiple denominations exist as a result of baptism alone. Throughout history, scores of Christians have killed and been killed over this issue. What Jesus meant for beauty has often been reduced to pain.
I'm happy that this is not the case in the simple church. Although my experience is somewhat limited, I'm thrilled that baptism is a source of unity and joy rather than pain and division within house church life.
One of the primary reasons for this is that infant baptism is not an issue in simple church. Only believers are baptized (I realize that exceptions may exist; I'm speaking about the general rule). Why is this?
The reason is simple. It comes down to method of scriptural interpretation. The method is one of following what the bible commands, teaches, and models for us about church life. The bible shows us churches that meet simply in homes for mutual edification. The bible also only shows us believers being baptized.
Christians who are attracted to house church life are also convicted to follow biblical baptism practices. This results from consistency in biblical interpretation (it is certainly possible that some parents within simple church will desire to baptize their infants. If this occurs, my hope is that the local body they are a part of can remain united while finding a way through this disagreement).
In general, infant baptism is not an issue. This allows us to rejoice in baptism without there being any angst about it. For this I am very thankful.