A lot of the “what we know so far” articles name a church. For example - https://www.yahoo.com/news/know-far-austin-bombing-suspect-163611376.html - says “attended regular church services at the Austin Stone Community Church.”
From that article:
"Jensen was one of only about a dozen friends listed on Conditt’s Facebook page before it was removed on Wednesday morning.
The two were close in 2012 and 2013, said Jensen, who would often go to the Conditts’ home for lunch after Sunday church service and attending Bible study and other activities together.
“I know faith was a serious thing for him,” he said. “I don’t know if he held onto his faith or not"
5 to 6 years can be a long time, especially in a young person's life. Going from a church-goer to a non-religious pot smoking pseudo-rastafarian type could very well occur in that time span.