to be honest I am not really sure why you need to have a team in the NFL when you obviously aren't familiar enough with the league and sport otherwise you wouldn't be asking for advise on this ... I mean it's not like the world is gonna end if you don't have a team in the NFL
It makes sense, at least to me, to be a fan of a team when you feel a special, natural connection with that team and their philosophy as an organization ... not when you wait for someone to sell you the idea of supporting a given team well enough so you can go and buy their scarf the next day

... that's a pretty artificial and forced way of looking for a connection that really isn't there, imo.
now, obviously someone has been trying really hard to sell you on supporting the Lions - and yes, they are a bunch of overcompensating, perennial losers

- but you seem to biting into this mostly out of some need to find a team and not because you feel that connection with them, which seems rather pointless imo.
All in all, which team to support is a choice you need to make on your own, not wait for someone to push you into it.