adj. 25B6; adjective
a devout Christian : PIOUS, religious, devoted, dedicated, reverent, God-fearing; holy, godly, saintly, faithful, dutiful, righteous, churchgoing, orthodox.
a devout soccer fan : DEDICATED, devoted, committed, loyal, faithful, staunch, genuine, firm, steadfast, unwavering, sincere, wholehearted, keen, enthusiastic, zealous, passionate, ardent, fervent, active, sworn, pledged; informal card-carrying, true blue, deep-dyed.