On October 22, 2023, Bagent became the first Division II undrafted rookie quarterback to start an NFL game since 1950.

[8][9] Bagent became the starting quarterback for the Shepherd Rams as a freshman in 2018 and made his debut on September 1, 2018, against Notre Dame (OH), where he threw for 518 yards on 36 completions and 54 attempts and three touchdowns in a 35–33 loss.

[12] Against WV Wesleyan, Bagent set the school and MEC record for touchdown passes in a single game with seven in Shepherd's 58–35 win.

[18] Bagent won PSAC East Offensive Athlete of the Week again after throwing for 413 yards and three touchdowns in a win over No.

[25] On October 9 against Lock Haven, Bagent helped the Rams put up 75 points in a 75–21 blowout win.

[36][37][38] On December 3, 2022, Bagent broke the record for touchdown passes across all NCAA divisions with 159, in Shepherd's 48–13 win over IUP during their quarterfinal game.

[43] He was named third string on the Bears depth chart to begin the 2023 season, behind starter Justin Fields and veteran Nathan Peterman.

[44] Bagent made his NFL debut for the Bears against the Minnesota Vikings on October 15 after Fields left the game with an injury.

[45] Due to Fields's injury, Bagent was named as the starter for the Bears Week 7 game against the Las Vegas Raiders.

[48] On Sunday Night Football, Bagent completed 25-of-37 passes for 232 yards, two interceptions and also had a rushing touchdown in the 30–13 loss against the Los Angeles Chargers.

[49][50] In Week 9, Bagent completed 18-of-30 passes for 220 yards, two touchdowns, and three interceptions while also losing a fumble in a 24–17 loss to the New Orleans Saints.

[51] He started one more game on Thursday Night Football the following week against the Carolina Panthers, where he led the Bears to victory 16–13 as he went 20-of-33 for 162 yards.

Bagent threw for 859 yards, three touchdowns, and six interceptions with a 2–2 record during his four-week stint as the Bears' starting quarterback.

[54] Bagent entered the 2024 offseason competing with Brett Rypien for the Bears' second-string quarterback slot, the latter having experience under new offensive coordinator Shane Waldron's system, but ultimately secured the job.

[55][56] He served as the backup to rookie Caleb Williams, with his only on-field action coming in garbage time or for quarterback kneels.