If I accept a Bible study, will I be pressured to become one of Jehovah’s Witnesses?
Yes. But a couple of things. It isn't a Bible study, it's a publication study. There is plenty of passive aggressive pressure to become a Jobot. Brainwashed? See........
"Minds must be cleansed" (Watchtower, June 1, 1953, p. 350 par. 24). 24 In these closing days of wickedness Jehovah’s people must demonstrate holiness. They must not foul their minds with the filthy mental food on the propaganda tables of this old world, but must feed on the feast of fat things Jehovah provides. (Isa. 25:6; 28:8.) Minds must be cleansed and made over, mental circuits formed by old-world thinking and acting faded out and new ones put in according to new-world specifications. By privately studying regularly, by attending all meetings regularly, and by engaging in all features of the preaching work regularly mental circuits are deepened and such good activities become habitual, not at all the struggle they are when the mental circuits are weak and faint because used only occasionally. For ourselves and for others, make them strong!—1 Tim. 4:16.